Well this is becoming all to normal. just updated to 3.1 and all was flying well. had done an autotune this morning and was then enjoying some of the new modes like drift & sports. well i was up flying when another member was taking off so i flew to the end of the runway to record the take off i was sitting in loiter and would have to say was flying great. he took off and i switched to drift to have the copter fly off out of control it flipped upside down and crashed. I am at a total loss to why this keeps happening. i have replaced all 4 esc from last crash with different ones now running affro 30amp with simmon k firmware. i replace the back right motor and half the frame. I am nearly ready to give it all up its just so frustrating. 1 step forward and 5 back every time only 10 flight between crashes and none have been my fingers. here is the log from the flight i all so have the video if that would be any help.