Hi everyone,
my router (Fritzbox) does this 24h auto-reconnection during every night to generate a new ip address. It seems like Home Assistant has a problem to reconnect to my xiaomi Roborock vaccuum sometimes when this happens. It is completely random. The one day there is no problem and the next day it happens.
It’s the only thing that seems to be affected, everything else is still connected in Home Assistant, and the robot vacuum is connected to the wifi and controllable through the app, but Home Assistant says “unavailable” on the vacuum entity. Then a random next day it just works as usual.