MacOS – My MacBook Pro disconnects from office wifi when other people join the network

I recently switched offices. The new office is located downtown, so there are multiple access points, both company controlled and external.

The laptop wireless disconnects shortly after I first connect to the network in the morning. It also seems to disconnect when groups of people join the network throughout the day (like, after meetings). I do not have this problem on other networks.

The problem only occurs with Mac laptops on our network. Linux, Windows, and Android devices all seem to stay connected.

OS X El Capitan (10.11.6)
AirPort Extreme (0x14E4, 0x134)
Firmeware Version: Broadcom BCM43xx 1.0 (7.21.95.175.1a6)
WPA2 Personal
RSSI: -50 dBm
Noise: -90 dBm
Channel: 132 (DFS)
Channel width: 80 MHz

I did use Onyx to collect information about the connection when it failed most recently.

From the bottom of the wifi.log:

Tue Aug 30 10:57:55.635 <airportd[62]> _SC_callback: Changed keys = { 'Setup:/Network/Interface/en0/AirPort' }
Tue Aug 30 10:57:55.651 SC: <airportd[62]> airportdProcessSystemConfigurationEvent: Processing 'Setup:/Network/Interface/en0/AirPort'

From wifi-oCZ0nU.log:

Tue Aug 30 11:01:34.033 Driver Event: <airportd[62]> _bsd_80211_event_callback: DUMP_LOGS (en0)
Tue Aug 30 11:01:34.034 Info: <airportd[62]> SCAN request received from pid 452 (WiFiProxy) with priority 2
Tue Aug 30 11:01:34.142 Info: <airportd[62]> QUERY SCAN CACHE request received from pid 345 (SystemUIServer)
Tue Aug 30 11:01:34.158 Info: <airportd[62]> GET CURRENT TETHER DEVICE request received from pid 345 (SystemUIServer)
Tue Aug 30 11:01:34.160 Info: <airportd[62]> QUERY GAS CACHE request received from pid 345 (SystemUIServer)
Tue Aug 30 11:01:34.162 Info: <airportd[62]> GET CURRENT TETHER DEVICE request received from pid 345 (SystemUIServer)
Tue Aug 30 11:01:34.179 Info: <CoreWLAN PPPController[345]> -[CWEAPOLClient eapolClientSupplicantState]: failed to retrieve 8021X state (2)
Tue Aug 30 11:01:34.180 Info: <CoreWLAN PPPController[345]> -[CWEAPOLClient eapolClientSupplicantState]: failed to retrieve 8021X state (2)
Tue Aug 30 11:01:34.260 Driver Event: <airportd[62]> _bsd_80211_event_callback: SCAN_CACHE_UPDATED (en0)
Tue Aug 30 11:01:34.262 AutoJoin: <airportd[62]> Successful cache-assisted scan request for WiFiProxy with channels {(
Tue Aug 30 11:01:34.262     <CWChannel: 0x7f95c5b13c60> [channelNumber=1(2GHz), channelWidth={20MHz}, active],
Tue Aug 30 11:01:34.262     <CWChannel: 0x7f95c5b11080> [channelNumber=2(2GHz), channelWidth={20MHz}, active],
Tue Aug 30 11:01:34.262     <CWChannel: 0x7f95c5b050d0> [channelNumber=3(2GHz), channelWidth={20MHz}, active],
Tue Aug 30 11:01:34.262     <CWChannel: 0x7f95c5b15ca0> [channelNumber=4(2GHz), channelWidth={20MHz}, active],
Tue Aug 30 11:01:34.262     <CWChannel: 0x7f95c5b0ead0> [channelNumber=5(2GHz), channelWidth={20MHz}, active],
Tue Aug 30 11:01:34.262     <CWChannel: 0x7f95c5b047d0> [channelNumber=6(2GHz), channelWidth={20MHz}, active]
Tue Aug 30 11:01:34.262 )} took 0.2275 seconds, returned 1 results
Tue Aug 30 11:01:34.262 Info: <Wi-Fi Menu Extra[345]> scan cache updated
Tue Aug 30 11:01:34.273 Info: <airportd[62]> QUERY SCAN CACHE request received from pid 345 (SystemUIServer)
Tue Aug 30 11:01:34.280 Info: <airportd[62]> QUERY SCAN CACHE request received from pid 86 (locationd)
Tue Aug 30 11:01:34.288 Info: <airportd[62]> GET CURRENT TETHER DEVICE request received from pid 345 (SystemUIServer)
Tue Aug 30 11:01:34.289 Info: <airportd[62]> QUERY GAS CACHE request received from pid 345 (SystemUIServer)
Tue Aug 30 11:01:34.292 Info: <airportd[62]> GET CURRENT TETHER DEVICE request received from pid 345 (SystemUIServer)
Tue Aug 30 11:01:34.307 Info: <CoreWLAN PPPController[345]> -[CWEAPOLClient eapolClientSupplicantState]: failed to retrieve 8021X state (2)
Tue Aug 30 11:01:34.308 Info: <CoreWLAN PPPController[345]> -[CWEAPOLClient eapolClientSupplicantState]: failed to retrieve 8021X state (2)
Tue Aug 30 11:01:34.489 Driver Event: <airportd[62]> _bsd_80211_event_callback: SCAN_CACHE_UPDATED (en0)
Tue Aug 30 11:01:34.491 AutoJoin: <airportd[62]> Successful cache-assisted scan request for WiFiProxy with channels {(
Tue Aug 30 11:01:34.491     <CWChannel: 0x7f95c5b04ea0> [channelNumber=7(2GHz), channelWidth={20MHz}, active],
Tue Aug 30 11:01:34.491     <CWChannel: 0x7f95c5b09370> [channelNumber=8(2GHz), channelWidth={20MHz}, active],
Tue Aug 30 11:01:34.491     <CWChannel: 0x7f95c5b1c2b0> [channelNumber=9(2GHz), channelWidth={20MHz}, active],
Tue Aug 30 11:01:34.491     <CWChannel: 0x7f95c5b01c30> [channelNumber=10(2GHz), channelWidth={20MHz}, active],
Tue Aug 30 11:01:34.491     <CWChannel: 0x7f95c5b02f10> [channelNumber=11(2GHz), channelWidth={20MHz}, active],
Tue Aug 30 11:01:34.491     <CWChannel: 0x7f95c5b1c3c0> [channelNumber=36(5GHz), channelWidth={40MHz(+1)}, active]
Tue Aug 30 11:01:34.491 )} took 0.2290 seconds, returned 2 results
Tue Aug 30 11:01:34.492 Info: <airportd[62]> QUERY SCAN CACHE request received from pid 86 (locationd)
Tue Aug 30 11:01:34.744 Driver Event: <airportd[62]> _bsd_80211_event_callback: SCAN_CACHE_UPDATED (en0)
Tue Aug 30 11:01:34.747 AutoJoin: <airportd[62]> Successful cache-assisted scan request for WiFiProxy with channels {(
Tue Aug 30 11:01:34.747     <CWChannel: 0x7f95c5b15580> [channelNumber=40(5GHz), channelWidth={40MHz(-1)}, active],
Tue Aug 30 11:01:34.747     <CWChannel: 0x7f95c5b090b0> [channelNumber=44(5GHz), channelWidth={40MHz(+1)}, active],
Tue Aug 30 11:01:34.747     <CWChannel: 0x7f95c5b09a10> [channelNumber=48(5GHz), channelWidth={40MHz(-1)}, active],
Tue Aug 30 11:01:34.747     <CWChannel: 0x7f95c5b06850> [channelNumber=132(5GHz), channelWidth={20MHz}, active, DFS],
Tue Aug 30 11:01:34.747     <CWChannel: 0x7f95c5b12c90> [channelNumber=136(5GHz), channelWidth={40MHz(-1)}, active, DFS],
Tue Aug 30 11:01:34.747     <CWChannel: 0x7f95c5b14430> [channelNumber=140(5GHz), channelWidth={20MHz}, active, DFS]
Tue Aug 30 11:01:34.747 )} took 0.2557 seconds, returned 4 results
Tue Aug 30 11:01:34.747 Info: <airportd[62]> QUERY SCAN CACHE request received from pid 86 (locationd)
Tue Aug 30 11:01:34.979 Driver Event: <airportd[62]> _bsd_80211_event_callback: SCAN_CACHE_UPDATED (en0)
Tue Aug 30 11:01:34.981 AutoJoin: <airportd[62]> Successful cache-assisted scan request for WiFiProxy with channels {(
Tue Aug 30 11:01:34.981     <CWChannel: 0x7f95c5b070b0> [channelNumber=144(5GHz), channelWidth={40MHz(-1)}, active, DFS],
Tue Aug 30 11:01:34.981     <CWChannel: 0x7f95c5b1b960> [channelNumber=149(5GHz), channelWidth={40MHz(+1)}, active],
Tue Aug 30 11:01:34.981     <CWChannel: 0x7f95c5b0a9e0> [channelNumber=153(5GHz), channelWidth={40MHz(-1)}, active],
Tue Aug 30 11:01:34.981     <CWChannel: 0x7f95c5b1d500> [channelNumber=157(5GHz), channelWidth={40MHz(+1)}, active],
Tue Aug 30 11:01:34.981     <CWChannel: 0x7f95c5b0ba60> [channelNumber=161(5GHz), channelWidth={40MHz(-1)}, active],
Tue Aug 30 11:01:34.981     <CWChannel: 0x7f95c5b152c0> [channelNumber=165(5GHz), channelWidth={20MHz}, active]
Tue Aug 30 11:01:34.981 )} took 0.2337 seconds, returned 1 results
Tue Aug 30 11:01:34.982 Info: <airportd[62]> QUERY SCAN CACHE request received from pid 86 (locationd)
Tue Aug 30 11:01:35.470 Info: <airportd[62]> STOP BROWSING TETHER DEVICES request received from pid 452 (WiFiProxy)
Tue Aug 30 11:01:35.470 Info: <WiFiAgent[386]> STOP BROWSING TETHER DEVICES request received
Tue Aug 30 11:01:35.869 Driver Event: <airportd[62]> _bsd_80211_event_callback: SCAN_CACHE_UPDATED (en0)
Tue Aug 30 11:01:35.872 AutoJoin: <airportd[62]> Successful cache-assisted scan request for WiFiProxy with channels {(
Tue Aug 30 11:01:35.872     <CWChannel: 0x7f95c5b09f90> [channelNumber=52(5GHz), channelWidth={40MHz(+1)}, DFS],
Tue Aug 30 11:01:35.872     <CWChannel: 0x7f95c5b0a3b0> [channelNumber=56(5GHz), channelWidth={40MHz(-1)}, DFS],
Tue Aug 30 11:01:35.872     <CWChannel: 0x7f95c5b149a0> [channelNumber=60(5GHz), channelWidth={40MHz(+1)}, DFS],
Tue Aug 30 11:01:35.872     <CWChannel: 0x7f95c5b14dc0> [channelNumber=64(5GHz), channelWidth={40MHz(-1)}, DFS],
Tue Aug 30 11:01:35.872     <CWChannel: 0x7f95c5b17240> [channelNumber=100(5GHz), channelWidth={40MHz(+1)}, DFS],
Tue Aug 30 11:01:35.872     <CWChannel: 0x7f95c5b15940> [channelNumber=104(5GHz), channelWidth={40MHz(-1)}, DFS]
Tue Aug 30 11:01:35.872 )} took 0.8906 seconds, returned 4 results
Tue Aug 30 11:01:35.872 Info: <Wi-Fi Menu Extra[345]> scan cache updated
Tue Aug 30 11:01:35.883 Info: <airportd[62]> QUERY SCAN CACHE request received from pid 86 (locationd)
Tue Aug 30 11:01:36.375 Info: <airportd[62]> QUERY SCAN CACHE request received from pid 345 (SystemUIServer)
Tue Aug 30 11:01:36.387 Info: <airportd[62]> GET CURRENT TETHER DEVICE request received from pid 345 (SystemUIServer)
Tue Aug 30 11:01:36.395 Info: <airportd[62]> QUERY GAS CACHE request received from pid 345 (SystemUIServer)
Tue Aug 30 11:01:36.397 Info: <airportd[62]> GET CURRENT TETHER DEVICE request received from pid 345 (SystemUIServer)
Tue Aug 30 11:01:36.407 Info: <CoreWLAN PPPController[345]> -[CWEAPOLClient eapolClientSupplicantState]: failed to retrieve 8021X state (2)
Tue Aug 30 11:01:36.407 Info: <CoreWLAN PPPController[345]> -[CWEAPOLClient eapolClientSupplicantState]: failed to retrieve 8021X state (2)
Tue Aug 30 11:01:36.413 Info: <airportd[62]> START BROWSING TETHER DEVICES request received from pid 452 (WiFiProxy)
Tue Aug 30 11:01:36.414 Info: <WiFiAgent[386]> START BROWSING TETHER DEVICES request received
Tue Aug 30 11:01:36.524 Info: <airportd[62]> QUERY SCAN CACHE request received from pid 345 (SystemUIServer)
Tue Aug 30 11:01:36.537 Info: <airportd[62]> GET CURRENT TETHER DEVICE request received from pid 345 (SystemUIServer)
Tue Aug 30 11:01:36.538 Info: <airportd[62]> QUERY GAS CACHE request received from pid 345 (SystemUIServer)
Tue Aug 30 11:01:36.541 Info: <airportd[62]> GET CURRENT TETHER DEVICE request received from pid 345 (SystemUIServer)
Tue Aug 30 11:01:36.550 Info: <CoreWLAN PPPController[345]> -[CWEAPOLClient eapolClientSupplicantState]: failed to retrieve 8021X state (2)
Tue Aug 30 11:01:36.550 Info: <CoreWLAN PPPController[345]> -[CWEAPOLClient eapolClientSupplicantState]: failed to retrieve 8021X state (2)
Tue Aug 30 11:01:36.855 Driver Event: <airportd[62]> _bsd_80211_event_callback: SCAN_CACHE_UPDATED (en0)
Tue Aug 30 11:01:36.857 AutoJoin: <airportd[62]> Successful cache-assisted scan request for WiFiProxy with channels {(
Tue Aug 30 11:01:36.857     <CWChannel: 0x7f95c5b0e400> [channelNumber=108(5GHz), channelWidth={40MHz(+1)}, DFS],
Tue Aug 30 11:01:36.857     <CWChannel: 0x7f95c5b17700> [channelNumber=112(5GHz), channelWidth={40MHz(-1)}, DFS],
Tue Aug 30 11:01:36.857     <CWChannel: 0x7f95c5b17b20> [channelNumber=116(5GHz), channelWidth={40MHz(+1)}, DFS],
Tue Aug 30 11:01:36.857     <CWChannel: 0x7f95c5b17f40> [channelNumber=120(5GHz), channelWidth={40MHz(-1)}, DFS],
Tue Aug 30 11:01:36.857     <CWChannel: 0x7f95c5b10ef0> [channelNumber=124(5GHz), channelWidth={20MHz}, DFS],
Tue Aug 30 11:01:36.857     <CWChannel: 0x7f95c5b017e0> [channelNumber=128(5GHz), channelWidth={40MHz(-1)}, DFS]
Tue Aug 30 11:01:36.857 )} took 0.9852 seconds, returned 1 results
Tue Aug 30 11:01:36.880 Info: <airportd[62]> QUERY SCAN CACHE request received from pid 86 (locationd)
Tue Aug 30 11:01:37.923 IPC: <airportd[62]> ADDED XPC CLIENT CONNECTION [wdhelper (pid=75, euid=0, egid=0)]
Tue Aug 30 11:01:37.924 Info: <airportd[62]> DUMP TEMP WIFI LOG request received from pid 75 (wdhelper)

Here's the relevant access points from the scan:

'TS' <5453>, bssid=f0:5c:19:25:08:20, channel=[6, width=20], cc=US, type=11n, rssi=-52, rsn=[mcast=aes_ccm, ucast={ aes_ccm }, auths={ psk ft_psk }, caps=0x28], wpa=(null), wep=no, ibss=no, ph=no, swap=no, hs20=no, airport=no, 
'TS' <5453>, bssid=f0:5c:19:25:08:30, channel=[149, width=80], cc=US, type=11ac, rssi=-54, rsn=[mcast=aes_ccm, ucast={ aes_ccm }, auths={ psk ft_psk }, caps=0x28], wpa=(null), wep=no, ibss=no, ph=no, swap=no, hs20=no, airport=no, 
'TS' <5453>, bssid=f0:5c:19:25:36:a0, channel=[1, width=20], cc=US, type=11n, rssi=-55, rsn=[mcast=aes_ccm, ucast={ aes_ccm }, auths={ psk ft_psk }, caps=0x28], wpa=(null), wep=no, ibss=no, ph=no, swap=no, hs20=no, airport=no, 
'TS' <5453>, bssid=f0:5c:19:25:36:b0, channel=[36, width=80], cc=US, type=11ac, rssi=-57, rsn=[mcast=aes_ccm, ucast={ aes_ccm }, auths={ psk ft_psk }, caps=0x28], wpa=(null), wep=no, ibss=no, ph=no, swap=no, hs20=no, airport=no, 
'TS' <5453>, bssid=f0:5c:19:25:37:f0, channel=[132, width=80], cc=US, type=11ac, rssi=-59, rsn=[mcast=aes_ccm, ucast={ aes_ccm }, auths={ psk ft_psk }, caps=0x28], wpa=(null), wep=no, ibss=no, ph=no, swap=no, hs20=no, airport=no, 
'TS' <5453>, bssid=f0:5c:19:25:38:30, channel=[52, width=80], cc=US, type=11ac, rssi=-53, rsn=[mcast=aes_ccm, ucast={ aes_ccm }, auths={ psk ft_psk }, caps=0x28], wpa=(null), wep=no, ibss=no, ph=no, swap=no, hs20=no, airport=no, 
'TS' <5453>, bssid=f0:5c:19:25:39:60, channel=[6, width=20], cc=US, type=11n, rssi=-52, rsn=[mcast=aes_ccm, ucast={ aes_ccm }, auths={ psk ft_psk }, caps=0x28], wpa=(null), wep=no, ibss=no, ph=no, swap=no, hs20=no, airport=no, 
'TS' <5453>, bssid=f0:5c:19:25:39:70, channel=[116, width=80], cc=US, type=11ac, rssi=-63, rsn=[mcast=aes_ccm, ucast={ aes_ccm }, auths={ psk ft_psk }, caps=0x28], wpa=(null), wep=no, ibss=no, ph=no, swap=no, hs20=no, airport=no, 
'TS' <5453>, bssid=f0:5c:19:25:3e:f0, channel=[100, width=80], cc=US, type=11ac, rssi=-63, rsn=[mcast=aes_ccm, ucast={ aes_ccm }, auths={ psk ft_psk }, caps=0x28], wpa=(null), wep=no, ibss=no, ph=no, swap=no, hs20=no, airport=no, 
'TS' <5453>, bssid=f0:5c:19:25:43:c0, channel=[11, width=20], cc=US, type=11n, rssi=-38, rsn=[mcast=aes_ccm, ucast={ aes_ccm }, auths={ psk ft_psk }, caps=0x28], wpa=(null), wep=no, ibss=no, ph=no, swap=no, hs20=no, airport=no, 
'TS' <5453>, bssid=f0:5c:19:25:43:d0, channel=[132, width=80], cc=US, type=11ac, rssi=-49, rsn=[mcast=aes_ccm, ucast={ aes_ccm }, auths={ psk ft_psk }, caps=0x28], wpa=(null), wep=no, ibss=no, ph=no, swap=no, hs20=no, airport=no, 

Monitor results:

08/30/16 10:57:18.0800  LAN: WiFi interface can ping IPv4 router 172.31.98.1 . . . YES —— [1/1 (0% loss) min=1.3 max=1.3 avg=1.3]
08/30/16 10:57:18.2070  WAN: WiFi interface can ping DNS server 17.254.0.50 . . . YES —— [1/1 (0% loss) min=73.5 max=73.5 avg=73.5]
08/30/16 10:57:18.2070  TS / ch132 [RSSI=-50 dBm, Noise=-93 dBm, SNR=43, Tx=1053 Mbps]
08/30/16 10:57:18.2070  AWDL: Disabled [0 ]
08/30/16 10:57:31.2700  LAN: WiFi interface can ping IPv4 router 172.31.98.1 . . . NO —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:57:33.2830  QOS (BK_SYS) ping address 172.31.98.1 . . . fail —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:57:35.2960  QOS (BK) ping address 172.31.98.1 . . . fail —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:57:37.3120  QOS (BE) ping address 172.31.98.1 . . . fail —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:57:39.3220  QOS (RD) ping address 172.31.98.1 . . . fail —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:57:41.3370  QOS (OAM) ping address 172.31.98.1 . . . fail —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:57:43.3520  QOS (AV) ping address 172.31.98.1 . . . fail —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:57:45.3650  QOS (RV) ping address 172.31.98.1 . . . fail —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:57:47.3820  QOS (VI) ping address 172.31.98.1 . . . fail —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:57:49.3860  QOS (VO) ping address 172.31.98.1 . . . fail —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:57:51.3910  QOS (CTL) ping address 172.31.98.1 . . . fail —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:57:51.3920  TS / ch132 [RSSI=-50 dBm, Noise=-94 dBm, SNR=44, Tx=1053 Mbps]
08/30/16 10:57:51.3920  AWDL: Disabled [0 ]
08/30/16 10:57:51.3920  UNEXPECTED DROP DETECTED!!!

# --- Monitor Test Cases
08/30/16 10:57:55.6770  Wi-Fi On . . . YES
08/30/16 10:57:55.6780  Wi-Fi Associated . . . YES
08/30/16 10:57:57.6910  QOS (BK_SYS) ping address 172.31.98.1 . . . fail —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:57:59.7050  QOS (BK) ping address 172.31.98.1 . . . fail —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:58:01.7180  QOS (BE) ping address 172.31.98.1 . . . fail —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:58:03.7300  QOS (RD) ping address 172.31.98.1 . . . fail —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:58:05.7450  QOS (OAM) ping address 172.31.98.1 . . . fail —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:58:07.7600  QOS (AV) ping address 172.31.98.1 . . . fail —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:58:09.7730  QOS (RV) ping address 172.31.98.1 . . . fail —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:58:11.7870  QOS (VI) ping address 172.31.98.1 . . . fail —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:58:13.8000  QOS (VO) ping address 172.31.98.1 . . . fail —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:58:15.8150  QOS (CTL) ping address 172.31.98.1 . . . fail —— [0/1 (1% loss) min=0.0 max=0.0 avg=0.0]
08/30/16 10:58:23.8760  LAN: WiFi interface can ping IPv4 router 172.31.98.1 . . . NO —— [0/4 (1% loss) min=0.0 max=0.0 avg=0.0]

# --- Monitor Summary
08/30/16 10:58:26.7230  LAN Connectivity Failure

I've been told that this is mostly a personal problem and not something IT can help with, so I was hoping somebody here could help.