This just started happening after a week off for vacation. The strap would randomly drop out so I changed the battery, washed and tightened the strap and then disconnected and reconnected it. This didn't help and the problem seemed to get worst on my ride yesterday. Sometimes it would disconnect for several seconds and then connect with a value of 71 before it started picking up my HR again.
This HRM strap is not even 6 months old. I've contacted Garmin but am wondering if there is a way to factory reset the monitor?