Last weekend, while flying on top of a waterfall, my I1 changed the flight mode from P-GPS to ATTI mode by itself in a crucial moment, it drifted so quick within a second and I could not steer it away from a tree branch near by and felt down to the falls. Sadly, it did not survive the crash As I didn't change the flight mode, and I trusted the aircraft system before I took off with enough signal and number of satellites. All green lights and good to go. But then this happened still when it was only 50m away from me. Checked the flightrecord on the ipad, it showed that, at the moment I drifted there was 9 satellites, but the aircraft still changed the flight mode by itself from P-GPS to ATTI. Sent the log to Dji, they said even though there were still enough satallites, but once GPS signal dropped (I dont understand: GPS vs satellites, are they diff??), the aircraft changed to ATTI mode automatically and drifted as a result They rejected my claim, not sure what to go from here as I only followed what the device told me to do, and trusted it, yet this happened. It's easy to blame myself but what should I do differently? What would you do? One thing I do learn is "never trust P-GPS as it can still change"