So just recently my TV has began turning itself off every 5 minutes or so. It will turn off and then turn its self back on. I have been using Comcast HD with an HDMI cable. It is running software version 2010/08/14_001002. It also gives me error 600 when I try to update it online. Any thoughts? I have Geek Squad on it till 11/2012 so I might just call them tomorrow and see whats up. Now I'm off to see my daughters 23" Dynex crap since this one is ticking me off.