I had a two runs in the past week, with the last one happening last evening on a fairly easy run. My Heartrate should have averaged something in the high 140's with a max maybe in the 160's. However, at some point there was a change in my watch where the heart rate spiked up to 200's and 210's, with the lows being high 190's.
Nothing changed with the way I wore my watch and no change in effort.
Has anyone else had this happen and had a way to fix it?