thanks for your link in the other thread
I have only one of these sensors. Purchased Feb 2-19 so almost two years old. You asked about a firmware issue and I’m wondering if you have updated the firmware recently (or at all, I haven’t since new) ?
Second comment is that have you replaced the batteries during the sensors service life? If so how often? I seem to recall the senor reporting 100% battery right up until it died. I think I have replaced the battery once, and I think it was because it got flakey and the replacement battery cured it. Could be wrong thou… 
Anyhow, those are my only thoughts, frankly out of almost a dozen motion sensors purchased, these have worked the best
