Contact Thor my 2014 did the same thing on both sides and it was out of warranty they did a good faith warranty. It is best to take it to the factory repair center they fixed mine in a few days . The tech that worked on mine said that the screws holding the sides to the floor broke from being tightened to much and that there were not the required amount of screws installed when it was built. The dealer had to take pictures and send to Thor Service representative before it was approved. Dealer told me it might take them a month or two to fix it , glad it took it to Indiana.
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