Based on your description I may end up being the bearer of bad news or maybe not. The problem could be caused by the slide out not being adjusted properly and that would be a good problem to have as a Certified RV Technician can adjust it properly and the problem will be fixed.
Unfortunately I am more prone to think that you may have a structural problem with the slide out itself that is causing the problem. If it is a structural problem it could be quite expensive to properly repair.
Either way this is not something that a do-it-yourselfer should tackle. If you try to adjust the slide out or attempt to repair the structure of the slide out yourself you could cause further and more costly damage.
I am sorry that I could not be the bearer of good news.
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