My mavic was fine no issues ..fired her up today and the finals going crazy...thought a replacements needed...tried everything..recalibrate gimbal..didn't work..reied firing up while mavic on right side...didn't work..reflashed firmware...didn't work...was resigned to getting a replacement gimbal...was packing it away with battery still in and drone was upside down...thought I'll give it one last go...fired up and hey presto gumball centred after initialisation..been behaving since...very strange