Need some input; slide does not stay put

Thanks for the replies so far. Its after dark so all I can do tonight is check the manual. Hopefully theres some help there. I found a sweitch in a cabinet that's labeled "slideout manual override. Its off. When I first took the camper out 8 years ago a plate slid into the switch changing the position. That stopped the slideout from operating.I don't think the the issue has anything to do with this swich this time. But there is a procdure sticker in the door that mentions travel locks. Never knew I had them or their location. Hopefully the manual helps. Its odd that I never had this issue in the 8 years Im using the camper, which is why I thought something might have broken.
I'll also check the rollers, thanks Rickjo.