Replace the power unit by a decent 5VDC / 2A minimum unit, and restart Homey into recovery.
In the mobile app, select “Add new Homey” and select your model.
Follow instructions and wait for the menu option “Full software download” and select it.
This will install the firmware from scratch, and solved the weirdest zigbee issues.
Nothing of your data will be altered, but I’d recommend to have a recent backup at hand, just in case.
