Not with this sensor specifically, but lots of my sensors (mostly Zigbee) will begin sending spurious motion events when the batteries get low. This could be the same problem. Have you tried replacing the battery?
(In related news, don't believe the battery reports the device sends. If it says 100% then this is probably a bit odd, but pretty much anything below that could be good or could be dead with some devices in my experience...)
Do any of them list pending changes in the device screen. I had one do that and was able to fix it by bringing it closer to the hub, hitting configure on the device screen, and then hitting the wake button on the sensor.
Thanks for the ideas. They don't list pending changes and have a brand new battery. I excluded and re-included and that seems to have stopped the motion for now...
I noticed that the wakeupinterval is different on each of them with no setting to configure. 
Download the Hubitat app
