I would do a few things first. Remove the panels under the bed and check the bolt motors to start. On both sides, just inside the bed box, about the middle of the bed, there are four big bolts, bolting the bed box and slide assembly to the slide mechanism. Newmar doesn't use flat washers when they should. Those can come loose and throw the bed out of alignment.
Sometimes, sticky slide seals can cause it to bind and then release. Take an old cotton sock and fill it with about 7-8 ounces of talcum powder. Rub it on the exterior slide seals. For under the slide topper, attach it to a pole and then just bang it along the seal under the topper.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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