runaway

Ok guy this has started happening recently. It happens without any input and when you do give it input the right front motor spins up much faster than the left rear and the quad flips. any help would be great. I have redone the firmware on the FC and still the same issue. Towards the end...

I have a strange issue that just cropped up. I have a 450 quad with a kk2.0 board with 1350KV motors that was completely rock solid stable, one of the motors M3 started with bearing issues so I swapped out all the motors with some 900KV motors because I didn't have a replacement 1350KV. I went...