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HR data from chest strap showing weird numbers on my Forerunner 245

Hi,

since halfway of November, every few runs, the HR data from my chest strap is showing weird numbers om my Forerunner 245.

I am using a Polar H10 HRM and it properly connects with my watch. But during the run, and this can happen a few times, my HR numbers drop away, sometimes as low as 50bpm. This can happen for a few minutes but also for longer.

I already did a hard reset on my watch (software 11.60), changed the battery of the hrm, did a reset on the hrm.

I never have this problem when I use the same hrm on my garmin cycling computer or my laptop while cycling on Zwift.

I am wondering if somebody else experiences the same problem or can point me to the direction where I could be looking for the origin? Chest strap, connection or the watch?

Rgrds