Hey Dalys, we have the same problem with our Cougar. In fact, it's in the shop right now for the same problem again. Third time!! First, your extended warranty, if you have one, does not cover seals. After the 1 year Keystone warranty it's your problem. Like you, we keep the seals lubricated and use a cover during winter storage. The seals are lasting less than a year
Camping World replaced the seals and we have been using their 1 yr warranty to have the work done again. I contacted BAL/Norco and their tech support folks are pretty sure the problem is a lack of clearance between the side wall of the room and the frame of the slide. They like to see 5/8". Our clearance is no where near even 1/2". CW is trying to figure out if they can use a different seal or trim the OEM replacement. This is the second time they've done this replacement on their dime and I think the service manager is getting tired of it costing them $$$. I'll keep you posted with their latest recommendation. Whole thing is a big PITA. Hopefully CW and Norco can come up with a solution.