My Almond+ is frequently misbehaving now. It stops allowing devices to join the 5GHz network a few hours after a reboot. Sometimes the 2.4GHz network cannot "reach the internet". And recently, some of my wired devices were misbehaving.
A reboot cures most of this behavior for a while.
The only think I can point back to in terms of a change was enabling AT&T WiFi Calling on two phones.
Also, there were 2 iOS upgrades between the time Firmware R090 came out and these frequent drops.
Does anyone else use AT&T WiFi Calling? Or Verizon (etc.)? Have you noticed anything strange?