Well, I have found that it does occur with xgm. However, in a different way but thankfully much less frequently. There are two modes of spontaneous failure. The first is quite spectacular: simultaneously the speakers make a loud crack sound and everything goes black and dead. The second way is just a "quiet freeze" with no sounds, no capslock blinking, just a gentle freeze requiring holding down the power-on button in order to reboot. Anyway, at least the computer is generally usable with xgm.