Same problems here. I have a msi gtx570. Tried anything i could think and read about it. This system (and video card) is rock stable with anything else. Strangely, the crash occurred mostly in pvp. I’d even give a try with gw2 for mac, a Mac Pro and this card: it crashed the sane way!
Only way gw2 is playable : a little down clock of the video card with msi afterburner. Until this week it was running great, now the crash reappeared, got to set a further down clock to play…