Yes, thrust on Motor one fails. The cause isn’t always apparent in the log. ESC, motor or prop failure, intermittent fault or desync are possible causes. Current logging can sometimes give a clue but you don’t have it. What Motor and ESC’s do you have?
T-motor U13II 130KV with FLAME 180A and it was first test flight. Actually, Stabilize mode without payload flight was good. but After I tried to make PID setting while happen this .
I had a similar problem. a rotor overheated after a few minutes of flight, even coming to a halt, I suppose due to cutting of esc due to excess consumption or due to expansion of the engine itself. In any case the solution was to change that rotor.