Hi
I just finished marathon last week and noticed strange drop of my HR readings during workout.
I usually maintain 160~180 bpm while running, but after running for 2 hours, HR went below 140 and stayed there for about 15 minutes.
After watch recovered from strange HR readings, it happened again even though I didn't walked.
It also happend yesterday at the beginning of a 10K race. HR reading stayed between 160~170 bpm for the initial 15 minutes
and then suddenly went all the way up to 190 bpm which I felt like a correct one.
Anyone know why this is happening and how to fix it?
Some says an auto pause option could cause this but I'm not sure.
