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False - Abnormal Heart Rate Detection during Sleep

I bought a second hand FR55 watch 3 days ago. Every night while I sleep, the watch reads the wrong heart rate at certain times.
Firmware is updated. i also recording my sleeps with security camera. My bloodflow is not restricted. My hand is not in presure. https://www.twitch.tv/videos/1887785326
Also my sleep time during this 130-140 pulse detection is cuted from sleep duration in garmin app. 2 hours are cut from my sleep time. this mean 2 hours i have abnormal heartrate detectiuon.
I have Fenix 5 and never detect 130 heartrate during sleep. Also i use and Mi band 6 for bluetooth broadcasting. I just want to replace it why sometime he stop broadcast during sleep. But now FR55 also have problem with reading accurate heartrate during sleep.

  • during day i dont have abnormal heartrate activity. screenshots


  • i try workout mode Treadmill with broadcast mode during activity. i wear watch normaly and he never detect abnormal heartrate for whole sleep.
    also body batery and respiration not work during activity but watch still got sleep time, light, deep and rem sleep. usually i use broadcast heartrate mode.