Hey I have been getting these freezes too. This is what I know. When I am online it happens lots of times when I hit a kerb or another car. That made me think it had something to do with sound. My PC will freeze and the sound will loop for about 20 seconds. The weird part is then LFS comes back and says lost connection to host and everything is OK again.
But here is the weird part, when i am OFFLINE racing by myself, I get the same lockup, EXCEPT i am never returned to LFS. Instead, i get a windows blue screen and it is complaining about nv4disp.sys
Now that nv4 problem bluescreen I have gotten before when I play Oblivion. That is the weird part, because its almost the exact same lockup, except that when I'm online in LFS, i dont get a bluescreen, my PC comes back to life when LFS quits the race.
So here are my theories. Maybe when a sound file gets played, it is conflicting with the video. So maybe disabling write-combining eliminates that, and turning down AA or AF makes it less likely? Also, maybe the devs could answer this, but what happens when i get that Connection to host lost message? I ask because that is the only thing saving me from a blue screen, maybe quitting the race kills some action LFS is trying to do that escapes out of the problem before windows gives up?
Here are my specs:
Athlon X2 3800 (dual core)
asus A8N-E (geforce 4 ultra chipset)
EVGA Geforce 7800 (AA and AF turned on in windows)
Creative X-Fi Xtrememusic
2 gig dual channel ram
I think everyone who has this problem should also post their sound card