Had the same thing happen - except we were lucky that it didn't happen while driving down the road. Ended up being a bad cylinder for the larger slide. Lippert has a test routine that they can provide you which has the procedure to test with. Also, if you have the hydraulic 'Level-Up' system, these might also raise (or lower) with that hydraulic problem. YouTube video by 'Getaway Couple' shows it happening.
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