Aqara Vibration sensor phantom triggering every hour

Hey all,
I’m using an Aqara vibration sensor to monitor my old school doorbell. The doorbell vibrates quite a lot when ringing, so this was an easy retro-fit. It worked great for several months, but recently I’m getting “false alarms” pretty much every hour. I’ve changed the battery and tried to update the sensitivity, but the false alarms keep happening. What is strange is, that they happen (with a few seconds or minutes off) periodically every hour.

Does anyone have an idea what might cause this, or how I could fix it?

Thanks is advance!