During a ride, initially my Garmin hrm strap works perfectly. But 1/2 hour into the ride the HRM will suddenly drop to 76 beats per minute and stay there for the rest of the ride. I know my hr has not this dropped significantly due to soft pedaling, because I am usually about to vomit all over my bars.
I have changed the battery.
Anyone else having this issue? I am going to pick up a ant+ extension cord, but was wondering if it might be the Garmin HRM.