unfortunately I do not know the year or type of slide out system you have, but I will guess you have the Schwintek system. No it is not normal for the slide to stick everytime you use it. Although the Schwintek in wall slide system is a great product, its major downfall is the installation which happens at the trailer assembly plant. If the manufacture does not install this system perfectly square and plumb, it will cause problems. It is very sensitive and unforgiving to a sloppy install. As there is no real adjustment that can be done at the user level, I agree with Mark, you need to take it to a dealer. Mine had to trim and raise the wall track and raise the floor roller just to keep 1 corner from rubbing on the floor. tore a hole in my linoleum.
Jason & Wendy
2014 Ford F-350 Lariat 6.7L PSD
2015 Keystone Montana 3711FL
B&W Patriot 16K Fifth Wheel Hitch