Try disconnecting the link to the servo and check the steering mechanism is free. Because it doesn't pull to the same side all the time, makes me think that there's a sticky bit in the steering linkage somewhere. If it's free, fully from left to right lock with no binding when the servo is disconnected, then I would look at getting a shot of someones setup gauges and set up the camber and toe properly front and rear, if the problem still persists then try another servo.
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