If it's intermittent, it could be a level issue. Seems like there is some kind of torque on the frame every so often that causes a sticky door. Like it's racked a bit. You can check the opening with a carpenters square to see if it is indeed racked when you experience the sticking. Even if the frame is off just a little, it'll cause the sticking. The doors fit so well in these openings that if it's off even by an 1/8", it'll stick. Humidity can do it as well, especially if the frame or door contain wood. Sometimes steps can interfere with the entry door but I'm sure you have power steps, so I wouldn't think that would do it. Maybe try leveling manually to as close to perfect as you can and see if it sticks. Then do the same with landing gear up (unlevel). When I bought my fifth wheel, they said it was "ready to go". First trip, I checked the "AutoLevel" then checked with my carpenters level. It was off one inch right to left and almost two and a half inches front to back. Don't trust the system to be correct, check it yourself. I had to reset level manually and now she comes level every time. An off level RV can be the problem with a lot of window and door issues. Just a couple things I'd check if I was experiencing this.
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