Check that the bar the deck hangs on is in the bushing on both sides.
There was a problem with the popping out early on but I have not seen it on latter models so whatever was causing it to happen must have been fixed.
From memory it was the left side that usually popped out.
I remove both bushes, turn the rod diagonal between the rails refit the bushes then turn the bar square on the bolt up the bushes.
How the hell they do it is a mystery as there is stuff all clearence when it is all bolted back up and I really can not see a 3/4 thick rod flexing.