08-10-2009 10:24 PM
Do you have cable/satellite, or use an antenna? Intermittent sound and video is not uncommon for those using an antenna.
08-11-2009 11:23 AM
Do you connect via HDMI or composite/component? You could try some different connection methods to see if it's the TV or the cable company. If you suspect it's the cable company, call your cable provider and insist someone come out and inspect the box and the wiring.