I haven't seen anyone mention this bug in Painkiller yet

So I’ll be playing Painkiller, killin’ things, minding my own business, when suddenly, the game freezes up. About ten seconds later, it’ll start back up again, but my monitor will go dark and the power light starts flashing on and off, as though the sleep mode’s kicked on.

Anyone run into this before?

Perhaps a feature of the copy protection? 8)