Do the lines move at all? It could be timecode or closed captioning issues...

If you can adjust the height of the picture you may be able to get rid of them...but it may be the sign of pending issues.

My ex wife got a little tv when she turned 21 (back in Australia in 1982 or so, they were expensive then) - sometime in the '90's there was a "zzzzt" noise, and the height of the picture suddenly decreased and there were white lines at the top. I could adjust the picture height but figured that was it.

To my surprise, it still worked when we split up in 2002 and, according to the kids, it is still going.

So try adjusting first...

pjb999: Thanks for your reply.

The lines do not move, at least, not visibly. I don't recall seeing any control to adjust picture height, but I'll check again. I do remember having that control on our older sets.

As for the remainder of your saga, I sort of concluded that there was no connection between your tv and your marital challenges. I needed to make sure before I confronted my wife! :)