We've yet to have a window mechanism break, but we've had nearly all of the window's stick to their seals. Lubricating the seals is just another item I've meant to do, and didn't, but now that I see these problems arise like this, it's going to the top of my list!
Out of curiosity, is the new dual pane window design having the same issue? It was an option I wish I had ordered, but was talked out of by the dealer as problematic. Apparently twisting on the camper has caused them to lose their gas between panes.
2016 Ram 3500 4X4 Dually, 6.7 Cummins, 3.73
2017 Jayco North Point 377RLBH, Cummins/Onan Gen