http://bugs.winehq.org/show_bug.cgi?id=23578
--- Comment #59 from Lukas Niederbremer webmaster@flippeh.de 2010-07-18 17:02:02 --- O opted into the Steam client beta, and ever since I did that, I didn't get this bug even ONCE. The whole day, multiple hours of playing.
I'll observe this some more, but as of now I call it fixed for me!