As everyone else, I'm having the sporadic dropouts on my new Samsung NP550 and am really frustrated. I made the changes in the power management, rolled back the driver to version 15.5.6.48 and let Win8 troubleshoot the connection a billion times. All that didn't make a difference.
Above all, I wasn't able to connect to my router either. This changed when I disabled all the Intel services in the task manager, which I didn't want to do at first as there's more "Intel inside" than just the buggy 6235 card. The internet connected straight away and I was able to connect to my router again. So far, I'm still connected (will see for how long).