First, Is your unit a Fleetwood? They have a major window problem. It is so big that Lazydays in FLorida has built a shop just to replace failed Fleetwood windows. A really Poor design, according to everyone. One other thing. Most double pane windows in RVs do not have a vacuum (or gas) between the panes. They don't have seals that can take the bouncing and overall G-forces that an RV window is submitted to on the road. I suggest that if you don't have a leak, or a milky discoloration, then keep on truckin' until they get worse. Replacement of RV windows can get expensive.