Does anyone have this issue with their heart rate sensor going off during sleep? I've noticed this on my FR955 and Venu SQ 2. There are intervals where I noticed that there is no heart rate data collected during the sleep times usually happening right after going to bed. I've owned the Fenix 5, FR935, RF945 and never had this issue.
Both my FR955 and Venu has been replaced as it was initially suspected to be a hardware issue but looks more like a bug to me.