Despratly need to find out what is going on with my p2v that just will not fly. I thought I finely got my phantom vision that I have been trying to restore all ready to fly today and it just will not fly. at all . every time I try to take off it just flips up side down and crashes. tried about 20 times and it just will not take off with out flipping over. I even went and redid the imu calibration and have all the default gains set right and still keeps doing it. I even tried hand launching it 2 times and it just does a barrel roll and tumbles to the ground and makes like a lawn mower. Im about to just throw the frigging thing on the ground and stomp it to a million bits. during my over haul the motors were not acting right so I replaced the escs and the motors still were acting weird and some times stuttering even after replacing the esc's so I even went and replaced all 4 motors They were t motors to no less.. and even replaced the wires to. and i also had to replace the gps . It seemed like every thing was all good to go when I bench tested it. The motors were seeming fine. So today after getting a new DJI battery I figured it was time to try and see how she flys and then kept getting the flipping tumbling bull crap and I am at my wits end as to what the heck it can be. only thing I did not replace on this was the naza and the main board and the compass. So for heavens sake does any one have a clue what the hell could be causing this thing not to fly with out wanting to turn its self up side down and crash?