Hi,
I also face the problem with phone restarting and Suunto app for quite a while, regardless the Suunto App updates (now on 4.106.3). Also Android 12 on Xiaomi Redmi Note 9T. Also restored phone to factory settings but the problem keeps happening.
It has to do something with the Bluetooth connection.
If I have Bluetooth and position enabled on the phone, everything is ok.
Most of the times, if I turn off the Bluetooth and position then it’s possible to face a restart.
Most of the times It happens when:
I close the Suunto app and quickly turn off Bluetooth, then Suunto app tries to keep the connection alive
Sunnto app is closed, then a notification for a friend’s new activity pops, I click on it having Bluetooth disabled
Generally when I turn on/off the Bluetooth and the location
No other Android app seems to cause the phone restarting