Someone might find this helpful: I managed to reduce the number of driver
crashes considerably by disabling "suspend" and "off" mode in X.
Section "ServerFlags"
Option "SuspendTime" "0"
Option "OffTime" "0"
EndSection
In the last 5-6 days, the driver crashed only once and I managed to bring X
back without rebooting. For me, that's a huge improvement over the situation
before where I had to reboot 2-3 times a day.