Bill, do you have a slide out topper over this slide out? If so, the topper may be the culprit. The spring assembly may be binding and not allowing the slide out to move freely. What happens if you push on the top of the slide out? If is goes out, you may want to clean and lubricate the slide out topper as well as the slide out seals.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7