Took the WW out for a spin.
Afew times I was bumped out of the gunsite, to some weird position, looked to me like I was an ammo loader.
The only way I found to get back to the gunsite was to return to drivers position and then go to gunner.
Can't confirm this,but it seemed to happen when an enemy GV spawned.

If this was reported already,sry, looked but didn't see anything about this prob.