[Forza]

Start by checking the adjustable attachments at the back of the sunroof--make sure they are set high enough--that's free ... oh, and you can check the rubber clutch for perishing, but that's less likely given your above description of the problem.

Given what you described, however, I would suggest removing the sunroof transmission, disassemble, clean, and relube it, and replace the sunroof drive pinion gear (like $15 here at Pelican). No grease is used to lubricate the sunroof cables and the drive gear that moves them (any would ultimately gunk up the system), but the pinion gear will wear out eventually (read many years). Typically, a Golde sunroof with a worn pinion gear will operate just fine until near the end of closure (when resistance increases). At this point, the worn gears simply spins and "pops" across the wire that wraps around the sunroof cable, producing that God-awful, indescribable noise as things grind to a halt. A fresh tranny gear, in contrast, will continue to move the sunroof cable as intended to full closure. Clean the sunroof tracks, etc. while you're at it just for the Hell of it.

Easy fix. Totally DIY.