Now, an Ex Saturn Owner

[Cousin Jupiter]

I've now isolated the where exactly the problem is, and how to solve it.

Whatever bad connection is causing the problem, is in the top bend of the wire housing.

I have had several window failures lately, and when I grab the wire housing at that location, and put it toward me, the problem is solved and the windows work again.

So far, I have not tried causing the problem to happen, by pushing the wire housing at that location away from me, but I might do so in the future.

[derfderf]

It's probably a mostly severed wire that re-closes (the two sides of the cut wire pivoting to touch each other) when you pull on it. Bend it the other way and you lose electrical contact.

Now that you know where the problem lies, why not just fix it?
If you can't solder, strip the wire ends, hold them up in the air parallel, twist them around each other, put on a weatherproof wire nut (home depot/lowe's), some electrical tape for good measure....done,