"Thanks for the reply. I was test flying in Stabilize mode only when the fly away occurred. I could see the GPS being the issue if I was in loiter, alt hold, or a mode that needs the GPS locked. It could have switched to another mode, but I didn't…"
Quad APM 3.2.1. GPS & 3DR radio. This happened 4 times in the last 6 months. Tested today and flew 12 minutes in stabilize mode all ok. Replaced battery and again normal flight. I tested in my back yard. About half way through battery 2, quad…