Front window shade

Ours did the same thing. I was trying to move the coach from storage and it, like yours would only move and inch or so. I kept pushing the up and down switch and it would get a little further each time. After several times it 'broke loose' and worked fine. A couple of months later, after back in storage again, it repeated. Same situation, only this time it took less than a couple of minutes for it to start working properly again.
I cannot imagine trying to get up under that upper side to remove that roller and wiring