I would also suspect something stuck on or wrapped around the scissor
mechanism. Remember the regulator works on a scissor-fold design and
something catching between the two bars will stop everything in its tracks.
A good indicator might be if the window stops dead, or if one end
continues down slightly before it stops completely: the former would
indicate something jamming the scissor; the latter would be more likely
for something in the track, as that would stop one end of the glass first.
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