Aeotec Multsensor 6 MOTION always on

I’ve got 4 of these units and all have been working fine until a few days ago when one seemed to get stuck reporting motion all the time.

The battery reports 100% (it’s been in service for at least 6 months), and replacing batteries had no affect.

I reported it to Aeotec a few days ago, but haven’t heard back yet.

Any suggestions? This doesn’t appear to be a common problem, at least a quick search didn’t turn up anything similar here.

This unit is one of two setup in our master bathroom. If it were a humidity type problem, I would have expected both to be impacted.