My fr955 lost all historical hrv data on the watch this morning. I woke up looked at the morning report, there it still displayed the data, but when wanting to go into it, it frooze, screen went dark, came back after half a minute, and hrv and training readiness data was gone, and did not sync back from the phone. Have to start the 3 weeks over. Infuriating...
Running on 12.27
