I've never heard of that before. The only thing that comes to mind, is that maybe you have a problem with the "Main Board".
It could have been damaged by the battery during a crash possibly.
The thing you don't want it to be is the Naza controller. because of the cost of replacement. You can easily check this
by switching the M1 thru M4, ESC input leads on the Naza. So reverse 1-2, and 3-4, and see if the opposite motors
have the problem. If the answer is "yes", pull the Naza controller out, and slam it firmly against a hard surface, as it may
have a stuck accelerometer.
Hope you have success with this problem.