Welcome to JOF
Any chance that you could post a couple of pics, a 2011 model shouldn't be incurring this type of issue being a relatively new.
As 'Grumpy' mentioned, possibly a moisture issue...., I would check the slide windows for leaks/caulking, and also the slide roof focusing on the sealer taped that runs alone the outer edge of the slide roof covering the trim edge and screws.
I recall that there was an issue a year or two back with the slide roof sealer tape lifting up, possibly exposing a way for moisture to enter the slide wall structure.
Let us know what you find.