Not sure I have an answer for you but was in the same boat. We had ours back at the factory for other smaller issues and they noticed the bedroom wall was moving from the trim piece. They took the front cap off and trim pieces off and re-inforced the wall with longer (and more) screws and bracing. The frame itself was not the issue but where the aluminum studs for the wall attach to the frame was coming loose. The repair only took one day and have no problems since.
I guess the point of the story is that Keystone is aware of the issue and had no problem repairing mine even though it was out of warranty. I'm not sure if being at the factory service center made any difference or not. If you want information on the repair, Darryl at the Keystone Service Center is the man to call.
Hope this helps you some.
Phil
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