At least 3 times now my 830 has spontaneously reset. By that I mean the screen goes blank, then it goes thought its power up sequence. Today was the first time it happened during a ride. It seemed to remember that I was riding a course and allowed me to resume my ride. Previously it always happened after a ride was finished. I am using the latest firmware, phone was not connected. I have 3 sensors, speed, cadence, and HR all garmin ant+ Obviously there are some issues still.