Sleep Tracking on Enduro 3 - hiccups? Some hours not logged - what could the reason be?

Sleep Tracking on Enduro 3 - hiccups? Some hours not logged - what is the reason?

I wear the watch very tight, so I don't believe that the sensor lost contact... Never had these kind of issues with my Fenix 6 while wearing the silikon watchband


Does anyone know how I can fix this, so that the watch tracks all hours?

Or any advice on fixing the duration, so I get at least aproximately correct recovery?


Thanks and regards!