Wifi losing internet connection (while still connected to router)


I am facing an odd issue on macOS High Sierra 10.13.6. My wifi connection within the office is really messy now. Before I didn't have any issue for a few months. Furthermore wifi works perfectly fine with other networks.

There are 3 things happening periodically.

1) I am losing internet connection, but the laptop is still connected to wifi.

I was pinging and everything seems to be fine, and then all of the sudden I start getting timeouts:

64 bytes from icmp_seq=14195 ttl=64 time=4.036 ms
64 bytes from icmp_seq=14196 ttl=64 time=4.597 ms
64 bytes from icmp_seq=14197 ttl=64 time=3.270 ms
Request timeout for icmp_seq 14199
Request timeout for icmp_seq 14200
Request timeout for icmp_seq 14201
Request timeout for icmp_seq 14202
Request timeout for icmp_seq 14203
Request timeout for icmp_seq 14204
Request timeout for icmp_seq 14205
Request timeout for icmp_seq 14206
ping: sendto: No route to host
Request timeout for icmp_seq 14207
ping: sendto: No route to host
Request timeout for icmp_seq 14208
ping: sendto: No route to host
Request timeout for icmp_seq 14209

Tracerout is timing out.

2) Laptop is disconnecting from network and reconnecting in few seconds

3) Laptop seems to be connected (but now internet available), however when I click on wifi icon, I can see only 1 network (the one I am using) and no other network. After turning it off and on I can see 5-7 different networks

What I've tried so far:

  1. Remove network and connect again
  2. Remove and Re-Add The WiFi Service
  3. Tried to use static IP
  4. Reset PRAM and SMC
  5. Add new location in Network settings
  6. Reinstall OS
  7. Restore factory settings on a router
  8. Delete The Internet Preference Files (com.apple.internetconfig.plist,
    com.apple.internetconfigpriv.plist and others)

Unfortunately, the issue still persists. I am running out of ideas… I thought that the adapter could get broken but it works fine with other networks. On the other hand, I am the only one in the office facing this issue along with router so doesn't seem like router issue either.

Any ideas how to troubleshoot it?

Best Answer

I would try again after a Safe Mode (restart holding Shift ⇧) and see if the results are the same. Also, could you try using Ethernet to gauge the difference? Is this a laptop? If so, is there a case which could be removed? Any new equipment nearby (ie an electric fan, metal filing cabinet, etc.) which could be disrupting the signal? If it is a laptop, it is entirely plausible that the internal antenna has come loose or damaged (any repair or upgrade work carried out?).