Originally Posted by jfoj

You do not need BMW to "analyze" anything for you, you can analyze the problem yourself.

The problem could be due to a weak design or part, or the problem could be user induced in one matter or another. Either due to lack of use or abuse.

Abuse could be trying to open the window when it is iced up (someone is located in the North East!) to even how hard a door is slammed. Maybe not "intentional" misuse, but sometimes you have to stop and look at the much bigger picture.

Kind of like expansion tank failures, many of they are due to either overfilling the expansion tank and there is no room for expansion to a expansion tank cap that dues not vent properly.

And correct, many forum members here and on every forum come to share experiences, compare problems, and understand how to fix specific or common problem. The only real way to solve problems over the Internet is if there is a common problem that many people have personally addressed.
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Agree that you can do some failure analysis yourself. In the case of the
window regulators, I think I've identified part of the problem. The most
recent failure here is at the top of the slide attachment where it connects
to the cable that lifts the window. The cable has a little barrel shaped
fitting crimped on it. That press fits into plastic on the slide. That is
all that holds it in. In this one that failed, the plastic had started to
break away, so that the cable would pop out. It looks to me like the
failure could be prevented or lessened by securing the cable laterally
with two cable ties, one above where the cable connects, the other
below it. That keeps the cable firmly seated in the slide. Without it,
I think what happens is that barrel crimped on there tends to work
around, gradually wearing on the plastic, fracturing it, etc until the
plastic can no longer hold the cable and the cable pops out. I just
repaired mine using two cable ties. I would recommend doing that
on any replacement ones.