Could be the channel (holds the glass and connects to the regulator) beginning to fail? They rust and split which allows the glass to move out of alignment.
The new style uses the same lift channel and regulator as a NAS Disco 1 and the window glass itself is the same on all RRCs with plastic door mounted mirrors and Disco 1s.Early 95s have the old style, newer 95s have the new style. Unfortunately many of the newer 95 parts are one off to the end of production in 96.