Hal, typically this indicates something has increased the load/drag on the slide room itself. Perhaps a bad bearing? Roller? Yes it uses a load sensing controller. Generally the electronic controllers either fail or work, they usually dont become intermittent, and once adjusted, they do not wander out of adjustment. Any unusual streaks or scrapes on the underside of the slide? When fully closed examine the exterior slide trim and see if it appears to be square to the opening, or perhaps notice any "clean" areas where it may have once ridden against.
94-Newmar Kountry Star 40-KSDP
Spartan/Cummins 8.3C-300HP/Allison 3060 WTEC-II/25yr RV Tech RVIA Certified/Onan-Cummins Certified