We had a 2013 330RLS and I held my breath every time I ran the kitchen slide in or out. It was always very slow compared to the other slides, but it always worked. I was also very anal about being level before I ran that slide out. Several other members suggested holding the button for extending/retracting for ten seconds after the slide stopped moving to make sure it recalibrated and I did that.
2013 Denali 330RLS, Fifth Airborne King Pin Box, Equa Flex, JT Strongarms
2011 Ford 250 6.7L dsl