Lexus GS Rear window won't go down.

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One of the back windows won't go down - 2008 GS450h in cold weather (but no lower than 25 degF, -4 degC).

After having warmed the car for a bit and while driving, I tried to lower each of the windows in turn from the driver's master control. Three lowered (and then were raised by me again after a few seconds) fine.

The fourth one (rear window driver's side) I heard the motor straining and immediately released the button.

Later, when all was warmed up, no sound at all when I tried the same window, both from the driver's control and the rear door control as well. I tried Up as well as Down. All the other windows work as expected.

Please, what are the likeliest causes and fixes? Thanks.