It could be a defective device, but normally I would just guess that the neighbor tables need to be rebuilt and suggest a network heal and point you to the sensor FAQ if that didn’t work. ( The FAQ says open/close sensors but applies to motion sensors as well.)
However, as it happens, for the last few weeks there have been a number of things broken in the platform and these can affect zigbee devices like your sensors.
In particular, there’s a scheduler issue where things which are coded to happen in milliseconds are instead being assigned to seconds (1000 times longer) and therefore some of these are timing out. That can be a big issue. There’s supposed to be a fix coming for that particular problem this week.
So I’m not really sure what to tell you. You can go through the steps in the troubleshooting FAQ and see if any of that helps. Or you could just wait for the platform update and see if that helps. If you’re close to the end of your return period., You might go ahead and return them just in case it is a defective device. It’s just a really hard time to troubleshoot right now.
