Sounds like the top clips are getting worn. I think the real fix is to replace the clips prior to the plexi glass taking flight. Others have zip tied over the clip to secure in place, which I hear works well. I placed felt pads at the bottom of the glass to hold it in place mainly becasue I was going to lump new clips in with my next order or parts....
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'01 Boxster S - Silver/Gray
'58 356A Cab - Fjord Green/tan
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