We are seeing the same issue as well although we have had no leaks. Seems to have occurred during this past summer more than before. We were doing a fair amount of desert camping with temps nearing 100 so I'm pretty sure it is heat related. I have made it a habit, based on recommendations from others, to use a clear silicone sealer each fall around the tops of all the windows, doors hatches etc. This insures a good seal against any degradation in the original sealant due to vibration and the usual wear and tear. Since seeing the ooze mostly coming from the lower section of the windows, I have been trying the following "simple fix" and so far it seems to work. I use the plastic putty knife and push the original sealant back under the window frame. Most of it will mush back up in there. Then I run a bead of the clear sealant around the entire window making sure to fill in any gaps. So far no more ooze and no leaks (we've had a pretty wet summer). The hope is this "simple fix" will hold up. Next summer's outings will tell for sure.
FR Wildwood 22 RKS
2007 1/2 Dodge 2500, Cummins 6.7
Retirement training completed
Currently enjoying second childhood