Garmin forerunner 965 not tracking sleep no matter what

Hi. My Garmin forerunner 965, bought 1.5 months ago in the USA, is not properly recording sleep and HRV past few days. Problem started from last week. Last Friday did not record, last Saturday worked fine, last Sunday recorded only one hour of sleep, Monday no data, Tuesday 39 minutes, Wednesday no data. I am wearing my watch 24/7. Watch is not in battery saver mode. I have entered all necessary data in User Settings. My sleep window is 11:00 PM - 07:00 AM set in the Garmin connect app, bu may sleep anytime from 10:00 pm to 11:30 pm and wake up from 5am to 6:30 am. I do not sleep with active or paused activities. Previously I never had this problem. Please help.