When I'm exercising my heart rate seems suspiciously low so I take the watch off, I put it back on and I'm at 125bpm, 20sec later I'm already down to 65bpm. Cleaned the sensor multiple times already, turned the watch off and on, its up-to-date. It's not super tight around my wrist but not lose either, it's always in contact with my skin. Any fixes for this issue or is the watch broken?
I've seen the website where it says weightlifting and rowing, etc can cause problems but it also happens when walking for example, when I go for a good walk my heart rate would be around 115bpm but sometimes it stays around 60bpm the whole walk.
Thanks.