It's the connection in the door harness.... next time it acts up just jiggle the black rubber accordian and it'll start working again. Had the same issue w/ this silver Z06 I recently acquired.
I know my father had it in for warranty work on the RT side window being inop and they were able to fix it and never replace the motor etc.
So before you go diging into the door panel, mess w/ the accordian sleeve.... Bill Curlee has a pretty detailed thread on CF about cleaning it up etc.
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