[DaveNP]

From what I can recall when I swapped mine from an 850 to the V70 there are a couple of types of bracket, mine has three bolts clamping the bracket to the tailgate hinge arm and two bolts into the spoiler, but there also seems to be one where the bracket is not solidly attached to the tailgate hinge but relies on a hook around the hinge arm with a 'rubber' packing piece to work against the screws pulling the bracket towards the spoiler, if you've got the type with the rubber packing piece maybe it has deteriorated and is allowing the spoiler to move.