[Wine] TF2 random quit

[Wolvenreign]

Hello all. I'm having a spot of trouble with Team Fortress 2 under WINE. You see, the game appears to randomly stop working and blank out. Here are my system specs:

Motherboard: MSI 790GX-G65
RAM: 4GB DDR3
CPU: AMD Phenom II
Video Card:PNY/Nvidia GTS250 Performance Edition

After the screen blacks out, I am returned to my desktop, with the resolution still at TF2's max. (Not as big as Nvidia Xserver's max.) But that's not the big problem. How do I stop TF2 from randomly quitting?