First : sorry for my english, i'm french

I have a problem with counter strike source.
I'm on Ubuntu 8.04.2 Hardy ( and not Studio, i just have the ubuntu studio skin ), i have an ATI radeon 4850 graphic card ( with the latest drivers installed ) and Wine 1.1.18 . ( also 2GB of ram and 32 bits version of ubuntu, it's called " x86 " )
To launch the game, i put " WINEDEBUG=fixme-all wine -fullscreen -w 1440 -h 900 -refresh 60 -dxlevel 81 -console -heapsize 1024000 "$@" " in the css / properties / set launch options ( i don't know if it's like that in English, i tried to translate ) then i launch the game with double click or launch button
See my screen if u don't understand

http://moe.mabul.org/up/moe/2009/04/02/ ... 2y1npn.png
The problems are :
sometimes the game crash wen i try to join a server
sometimes the game make crash the system when playing / joining a server ( i have to reboot with the button on the case )
sometimes i can play 30mn / 1h without any problem ... then the game crash ( close without any error message )
very often the game crash just after i joined a server ( 2 or 3mn after joining a server )
I tryed to reduce the resolution ( 1024*768, 1280 * 1024 ... ), make the game " windowed " ( not fullscreen ) and to turn Compiz Fusion OFF, but problems stays !
I dnt know what can i do ...
If someone got a solution, tell me ... thx
I hope u understand my message


Have a nice day