Sounds like you need to get the slide adjusted. You can adjust it yourself but if you're close to the dealer and they have a good service department, I'd bring it back to them to fix it. I'm assuming it's the dining room slide which is the only hydraulic slide. It's actually pretty easy to adjust yourself. If it were one of the shwintec slides, i'd probably leave that to the dealer.
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2016 North Point 377 RLBH
2006 Ford F350 Lariat, CC, 6.0PSD, DRW, SCT tuner, air bags, bullet proofed