Same problem here, some devices just loose functionality even though they are still connected. They are still in homeys devices list, but some dont have connection in the nodes list of the zigbee network.
This mostly happens with the Aqara line of motion sensors, and some wall switches.
Also the power plug loses its power-usage-reporting, while its on-off functions still work.
I suspect this is another Homey issue with zigbee in general…?
