Missing HR Data on Marq Athelete

Has anyone been having this issue lately?  It just popped up for me over the last week & I’ve had the Marq for almost 3 weeks. There will be 2-5 hour gaps where no HR data is recorded. Last night for about 5.5 hours during sleep, my Marq recorded no HR data. It weirdly recorded HRV but no HR, Respiration, O2 data