About two weeks ago I have updated BIOS to the latest version for my N56VZ and it didn't changed anything, but later I have installed Ubuntu 13.04, and now I have this problem quite infrequent! I can't judge the hardware or software specefic details, but at least it's not so annoying, so if someone can't bare it more, try upgrading distro and bios, may be it will help.
About two weeks ago I have updated BIOS to the latest version for my N56VZ and it didn't changed anything, but later I have installed Ubuntu 13.04, and now I have this problem quite infrequent! I can't judge the hardware or software specefic details, but at least it's not so annoying, so if someone can't bare it more, try upgrading distro and bios, may be it will help.