Drive the slideout up onto some wedges as far as you can and not damage the roof and when it is about 8" extended. This will give you room to clean and lubricate the nylon ramp the room has to climb when retracted. Clean all the dust and dirt, then use some dry silicone spray and give it a light coating. While you are at it, lubricate all of the mechanical components of the slideout. This should make the difference, if not, you may check for wiring connections to be breaking down. If these are clean and good then a motor may be getting tired.
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