When I had this problem in a previous Volvo, I removed the switch, took it apart and cleaned the contacts. This cleared up the problem. I have not attempted to get the switches out of my S70, though. I suspect the problem is switch related. I don't think the new switches can be disassembled, but this interesting thread came up when I did a search on the brickboard, using the search term 'window switch'
http://www.brickboard.com/AWD/?id=430527
(To search, use on of the pull-down menus, above.)
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David Our long national nightmare of peace and prosperity is finally over - The Onion 98 S70 T5SE // Black, misc mods (mostly lighting), red calipers 92 940GLE // Hella Micro DE foglights
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