Seems it cant centre itself on the roll axis, like the position sensor is out of whack and the end range of movement isnt physically where the sensor exoects it to be and its trying to drive itself past the limit.
Its definately not centering level after it tries to initialise itself.
I don't think it has, Everything still looks good on the videos and gimbal goes every way it should. Just makes that noise and doesn't stay level sometimes.