If the slide works again just by hitting the switch, sounds like a heat problem somewhere in the system due to high resistance--there may be an automatic reset breaker in the motor itself? Cheapest, easiest thing to do is replace the switch and see if that helps.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired