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REM not tracking?

I've had the FR245 for three weeks or so, and for the last couple of days, it seems to have stopped tracking REM sleep. It even says on the app that my device doesn't tracked REM. Yet I was tracking REM sleep until just a few days ago. Also, the Pulse Ox (red light) keeps activating in the middle of the day randomly, unless I turn of Sleep Pulse Ox. Is there any explanation for this? Did anyone else's device stop tracking REM?