This is round 2. 10.43 did the same thing. On restart it got stuck on "Reset default settings" for ages. After considerable time pressing NO, it finally restarted and loaded the software, but it deleted ALL of my sensors (I have three bikes with Garmin pedals, speed sensors, cadence sensors, Di2, heart rate straps - everything GONE). I spent two hours last time re-entering all the sensors, and just now with 10.44, all the sensors are gone again. Garmin Connect welcomed me to my "NEW" fenix 7, and the only thing that remained was my custom face. Everything else is completely zeroed out.
Is this what I should expect from the fenix 7? My fenix 5 never gave me any issues like this, and I thought the 7 would be an upgrade. FWIW, the device is very close to one year old now.