After update i have problem with wrist hr after exercise when i use hr belt .

The same thing happens to me here. I use the Polar Verity and after a run I take it off my arm and turn it off. Then sometimes after minutes, sometimes after hours, it can happen quite reliably that the HR sensor on the watch delivers crazy values ​​far above my MaxHR, sometimes even warnings about "abnormal heart rate". Of course, this pretty much ruins all of my training values ​​and I'm glad that I have something like runalyze. I've gotten into the habit of turning the watch off and on again after every run, then there are no problems.