False alarms with the motion sensors have been a problem since the V2 versions were introduced. Yours were working, now not. They can be triggered by virtually any heat source, like a central heating duct.
The problems seem to be random, without any identified trigger.
I just did it on the weekend for the door sensor and motion sensor. They both seemed to work fine in the test mode then. Today I set the alarm and it gave me an entry alert and then a motion alert and set off the alarm. Very odd. I turned it off remotely and tried again in test mode and a few moments after setting it, the same thing happened. Never had any issues for a year . The only thing that’s changed is the batteries.
A few weeks ago I just installed Wyze monitoring with several motion sensors and today while I was not home I got an alarm from the dining room sensor and the police were dispatched. I got home about the same time that the police showed up and it was a false alarm. I had ADT previously and in the 7 years I had it I have never gotten a false alarm from their motion sensor. I was wondering what other people’s experiences are with false alarms from their Wyze motion sensor.