Drivers window CLACK noise when closing, regulator going?

[Dupersenior]

When I closed my driver's side window this morning, I heard a loud CLACK sound... almost sound like something snapped. I opened and closed it again, and it made the noise again about 2" from the top position. The window closed all the way and didn't appear to slow down or anything.

I know problems with window regulators are common on X5s... is this an indication that mine's going break soon? If it's a sure sign of impending failure, I'd rather replace it now than have it get stuck down while driving.