since ~1 week, i have wifi problems with my MT hap ac^2.
All devices get irregular disconnects and no device is able to reconnect to the access point any more. Ethernet connection is still possible.
I'm using Firware 6.42.2 - but I have the same issue with the latest RC version.
The first time it happened the Log showed the following messages:
disconnected, group key exchange timeout disconnected, unicast key exchange timeout
With my hap lite, i didn't have any issues like that for more than 2 years.
However, the group key exchange remains.
Update interval is 5 minutes. Using WPA with AES. WPA Passwort consists of letters and numbers only.