Wi-Fi Interfering with Bluetooth Mouse

I think your best bet is to see if you can borrow another BlueTooth mouse (or a keyboard) from somewhere so you can test to see if it is BlueTooth failure in the Mac or the Mouse.

Is there anything in your logs at the time of the failure? Those logs look ordinary - there are no processes dying or panics close to those times?

Bluetooth and IEEE 802.11/b/g/n (WIFI) use almost the same frequency bands:

• Bluetooth: 2.402 - 2.480 GHz (79 channels)
• WIFI 2.4 GHz (IEEE 802.11/b/g/n): 2.4 – 2.4835 GHz (11, 13 or 14 channels depending on the country)

Usually Bluetooth uses frequency hopping and changes the possible 79 x 1 MHz bands 1600 times a second to avoid disturbances while WIFI uses fixed channels.

Obviously something went wrong developing the latest Bluetooth- or WIFI-drivers.

The only workaround until Apple gets their drivers fixed is using dual band wireless access points. Those devices use two different frequency bands: 2.4 – 2.4835 GHz and 5.18 - 5.825 GHz (with some gaps). Connecting to WIFI 5 GHz (IEEE 802.11a/h/n) will not interfere with Bluetooth.

Almost all Macs sold since 2006 support 802.11 a/b/g/n.

Apple's answer: Wi-Fi and Bluetooth: Potential sources of wireless interference

BTW: Not only typical RF-based devices (like wireless phones, etc) but also bad-shielded USB3-devices and cables interfere with WIFI (2.4 GHz) and Bluetooth.