My wife's Edge 530 has periodically acted as though the Start/Stop button has been pushed during a ride when it hasn't. As far as she can tell, this seems to be happening only on really rough trails. Today towards the top of a rough downhill trail, it again stopped and was prompted to save the ride. Unfortunately she of course wasn't able to notice this until she reached the bottom and by that time she'd lost the data from that entire trail. We compared my ride to hers so we know right where it happened.