I am currently using a Lenovo T400 and using 1.2 Tremulous. Using WarriorHUD-1.5.1.pk3 as the only mod. Windows XP.
What happens is that my computer will randomly freeze while playing on Tremulous. There's no specific action that I do that causes it, but when it does happen I have to manually turn off the power to restart it.
Not sure if this is just me, the mod, or the game.