I know there are many discussions regarding sudden descents on the discussion board and I've looked for something that matches my situation but haven't found anything. If there is, I apologize and please redirect me to the correct discussion. The low-down: P2V+. Current software updates on both RC and P2V+. Flown probably 50 times or so with no issues other than those created by me. Event 1: Flying at about 14,000 ft. (top of Pikes Peak after confirming it was okay with the Ranger), everything is going fine, >60% battery, moving laterally at maybe 10 kts, no significant wind, flew for about 6.5 minutes and then sudden descent. Lucky crash onto just about the only flat spot in the area. No damage, prop had spun off which seemed unusual and I thought that what caused the crash. No vibration or jarring, just slow drop while moving laterally followed by pretty quick vertical descent. Event 2: Fresh battery. Same altitude, same general area. Flew for about 2 minutes, flying laterally, same slow drop while moving laterally followed by quick descent. Flipped, 2 props broken but that was it. Event 3: Down at about 13,000 ft., about 1 mile away from original crash sites. Same battery as Event 2 but well over 80% to start, over 50% at eventual impact. Flying great for about 5 minutes, moving laterally and notice it's not gaining altitude even though I've got the left stick fully up. I was over a crater (a cirque to be accurate) and pushed the pitch full forward to deliberately crash at the lip of the cirque (before the P2V+ plummeted to the crater below.) I've flow at about 12,000 ft. before with no problems and I've heard of others that have flown at greater altitude with no issues. I am familiar (first hand) with VRS and this was not VRS (I was not descending and was moving laterally.) P2V+ was within probably 300 ft. of the RC, in direct line-of-sight. Battery was still on and the camera filming after each crash. I'm at a loss. The oddest thing is that I was flying just fine for a long time before it happened. And it happened 3 times in a row! My plan is to go to a safe area at lower altitude (6,000 ft.) and see if it happens again. I would be surprised if I did though. Any suggestions?