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245 bpm at the very start of a session with HRM (red version)?

I have the red HRM from Garmin but since a month back its been registereing some very high heart rates.

It happens right at the start of a session and it can take several minutes before it reaches normal levels.
I was able to reproduce this a few times by removing the strap and putting it back on, reconnecting to the strap and starting a new session.

I have been measureing my blood pressure when this occured and all was fine, heart rate below 70.

Is this a know fault when the band starts to fail or could be some kind of interference around my house/block or could it be that sensor actually picks up some kind of arytmic pulse?

Ive ordered a HRM Pro to be sure but was just curious if others have seen this happen?