I would try cleaning the window and getting a thin candle an rubbing it inside the rubber seal/window galley. This sometimes works because the wax reduces friction.
I use poorboys natural uv protectant but you dont need to go that far. Any mothers or meguiars rubber conditioner / protectant will do.
Failing this get some graphite powder from bunnings (usually in the door lock section). And put some on the that meets with your window at the base of the window opening
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