I have had exactly the same issue in the last couple of days there doesn't seem to be any pattern to it either. The problem is I only find it if I happen to open up the app to check anything
I discovered it was because we'd added it to a group for the room on Alexa, so everytime I asked Alexa to turn off the room, it was turning off the trv
It looks like you're new here. If you want to get involved, click one of these buttons!