Bathroom roof vent cannot be opened in Winnebago Vista

When my lid was sticking I went up on the roof and opened the lid and felt all around the edges to see why. The lid had a slight rough spot, and as the sun must have got the lid warm enough to maybe kind of twist it, the rough spot would drag on the rubber seal. I took a nail file and smoothed off the rough spot, used some rubber slick lube to the rubber seal. Never had to crawl up there again for a sticky lid. There is always a cause for the lid to stick, find it and fix it.