No sleep data after update to 2.90

Hi everybody, I recently bought a fenix 5 sapphire and after updating software to 2.90 it stopped recording sleep data. With the previous version it was working, well kind of working actually since it consistently failed detecting when I was sleeping and when I was waking up...but at least I could see some data..now it just says that there are no sleep data recorded.
Any idea?
thanks a lot!
r