In mose cases, those picture drops are a result of the handshake between the cable box and the television. If you turn off the cable box and turn it back on, it also should restore the picture.
Keep me posted.
I have a Samsung flat screen tv with model #: LN37A55OP3F
It was purchased Nov 2008. The sticker on the back says manufactured October 2008
while watching tv through comcast cable, the picture regularly disappears. I can still hear the sound. The only way I have been able to correct it is to shut off tv and turn it back on again.