We have same unit and not had that issue. Use a lot of water, always leave a little water in your black tank, and use cleaners.
I like to put about 3-5 gallons of water in the tank with a dose of cleaner. Then add some ice cubes to the tank as I am getting ready to leave the campground. The ice cubes help break the junk loose and then I pull into a pilot, flying J or rest area with a dump station and drain the tank. Cleans it pretty well.
You could possibly have some dried up toilet paper in your tank by the drain line? Try filling the tank with water, let it sit a while and drain it. Just a thought and good luck.
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