I’ve got 2 ST motion sensors (2 years old) that have gotten flakey at the same time recently.
1 was offline. I changed the battery for good measure. It worked briefly but went offline again. I reset it by removing & replacing the battery again and but now after reporting “motion detected” long after motion stopped (like 20 min) it is now back to offline.
Another one is online but is not triggering when there is motion most of the time (sometimes it works) . The battery reports as 60%. I have tried rebooting it by removing and re-inserting the battery.
Wifi levels are strong (eero). ST hub is Samsung 3rd gen with allowing firmware updates. I rebooted it after these problems began. Firmware version 000.041.00009. Controller version 2.2.15-4