It does sound like window regulator problem. I had the same issue. Use "search" and you will find tons of information on this topic.

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2010 BMW X6M (future car)
2006 BMW M6 Indy red/Portland Brown (sold)
2004 BMW X5 4.8is Silver/Black
2002 BMW X5 4.6is Black/Black (sold)
2004 Lexus RX330 Gold/Ivory (sold)
2000 Lexus GS 400 (sold)