Is there anything in the back pushing up against the back door?
I have had that before with my older GU's where I jammed stuff into the back and it was pressing on the Lock Button on the back door, as the older ones don't have any protruding material to stop the cargo being hard up on the lock itself.
I had to go for a drive - a bit of rough cornering and hitting the brakes hard to slide everything away from the door
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