Hi I got my 360 about a fortnight ago now and had this problem a few times from day one: About 2 days after buying it I hooked up online and updated which actually caused it again while updating but seemed to stop it afterwards. I assumed it was a case of the update fixed a known problem and thought no more of it. However tonight I had the same problem: Other channels all work fine, going to dash and changing settings did not help the problem (I changed resolution etc but no help), so I turned it off and its fine for now . Is this a common problem with the GPU or does mine a have a problem? I had hoped it would be less of a worry since I waited for a falcon model .