It happened a few times that my 17 pdr guns suddentry beacame repair tools. It happened 3-4 times when the gun was reinforcing near an halftrack, it lost all its usual commands such as camo, ap/he rounds and got a repair button, which was actually working cause i could repair my fireflies with it. Then the gun remained in ambush mode and could no more move.
It happens so rarely but maybe any dev could check this out