My First Ever ACRO / Manual / M-Mode with the DJI Avata 1. First Take Off Crash. Cinewhoop, FPV. 

Ahh, ok, that makes sense.

Not sure about the Avata 1, but I know with the Avata 2 if you loose you GPS for any reason in manual it switches to normal mode. Happened to me trying to fly into a train tunnel two videos back on my page. My best guess is that the cell phone tower next to you caused some interference causing that to happen.

or you went beyond you set altitude