Mine has the same issue. First look at the top, should be a "loose" wheel in the track, then look on the floor for the screw that attaches said loose wheel to the panel. Small machined Phillips head. If you can't find it lowes or Home Depot will have it. You will have to take the top rail off to reattach. Just use a little clear silicone to go back around the ends of the top rail. Not a lot of water gets up there but it helps hold it.
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