Watching Heroes timeshifted last night (HD) on my S3 (~30 minutes behind live airing), I noticed strange static in the picture. It wasn't the normal pixelization I have seen in about 2% of programs. This was 1 pixel wide horizontal white lines, 3 to 5 inches long, 5 or six on the screen at once, flickering. The problem went away 10 minutes into the show. Was this a TiVo, NBC, or Comcast (Philadelphia) problem? Is there anything I should do about it, or just chalk it up as an isolated incident?