If they are ZigBee make sure your signal is strong enough. I removed a SmartThings Outlet that was in my kitchen and all the sudden the lock by my garage door started doing the same thing (Need a ZigBee Repeater - Possibly Dumb Questions). Didn’t realize it until two sets of batteries…put the outlet back in and I was fine.
Might not be your case but worth checking…maybe something got removed/added? If yours are Z-wave and you’ve added/removed things try a repair. If they are ZigBee did a repeater get removed?