Originally Posted by ntjp

I do know what's going on as I've experienced it. It's a well known issue with their newer chest strap. The old one works, the new one can be very annoying indeed. Lots of posts on Garmin's forums about the issue. Check this one out - https://forums.garmin.com/showthread...uunn#post17601 . It would be worth your while reading the whole thread I think.

I know this is for a garmin 310xt, but I am sure they use the same strap across all their newer devices.