My HW277 did the same thing. It seems like it is only going through the minimal wood sidewalks. I now have a ROO IKSS and use this:
https://www.amazon.com/gp/aw/d/B00L4...UxL&ref=plSrch
It folds in for storage, more stable, and keeps heat away from the walls (possibly causing glue failure of walls).
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