There were a few hits on your problem. In the other posts the problem was related to heavy downloads (big files or torrents). It seems to be the Nvidia drivers but could be a hardware issue (sickly chipset) since there did not seem to be many posts on it like I would expect if it was just drivers. Is it still under warantee by any chance?
BTW The other posts were for multiple MB's (including ASUS) so it's not just a gateway problem.
BTW The other posts were for multiple MB's (including ASUS) so it's not just a gateway problem.