Slide hesitates, sometimes stops

I had the rig out of storage and followed up on some of the suggestions made. I am still concerned that the rubber wiper seals have stiffened over time but have no way to check them. Testing with a Shore A Durometer (which I don’t have anymore) would tell their hardness now but since I have no way of knowing what the hardness was when they were new, the current hardness doesn’t help much. The rubber seals do not appear to be cracked or brittle. I did apply ProtectAll to the sides of the slide, as well as adding silicone lubricant to the top, bottom and sides of the first six inches of the slide when it’s all the way out. But let me reply to the comments made on the topic. First, I don’t find any rollers under the slide. The incoming slide rises because it mounts on a ramp about 8 inches long. I added some silicone lube to that ramp. Second, I don’t see any water intrusion or swelling in the slide or opening in the side of the coach causing binding. Third, this is a mechanical driven slide, not hydraulic. Fourth, the switch is either engaged or not; increasing pressure on the switch does not seem to alter the slide response. Fifth, concerning the stoppage of the slide on incoming, I can instantly reverse the slide direction to full out without waiting for any electrical reset. Sixth, I had it at RV Service and they came up empty (of course that could be they just weren’t any good at solving this problem anyway). After the lubricating I did, the slide can be slow coming in, but doesn’t stop. The rig is now 10 years old; it’s possible that a good part of the problem is some sagging of the coach or the slide. I hope that isn’t the case since there might not be any cost effective way of improving the slide movement. When I have it out of storage again, I’ll check for electrical issues, such as corroded breakers and low voltage. Thanks for your suggestions.