I'm sorry to hear that you're having this issue.
Unfortunately, it's difficult to diagnose a television without being able to actually see the problem or see the hardware. If I had to guess, it sounds like an electronics issue rather than the panel itself, but again, that's just a guess.
The best suggestion is to have a technician come out and diagnose the problem. You can call 800-SAMSUNG, or fill out an online service request form here:
Less than two year old 46" Samsung LCD 1080p flat screen tv
This evening while watching satellite red pixelated vertical lines appeared in the screen. They were most noticeable in the black areas of the picture.
The TV had been running for approx. 30 minutes.
Channel was changed to other satellite channels both HD and not the lines were still visible.
Switched to PS3 and back to satellite (Directv) and lines had disappeared.
Please advise, we are concerned that there may be something beginning to fail in this tv.
Directv, PS3, Wii, xbox 360 inputs.
Never had any issue with picture on TV before.