It might be your tv and not your remote. We have an old tv in our bedroom and the remote stopped working. My clever husband bought a universal remote which didn't work, either. I went up to the tv and hit the spot where the remote transmits to the tv. My DH laughed at me and said, "yeah, I'm sure hitting it will help" and then laughed. Well, hitting it did work!

It occasionally stops working and I go hit it again. My DH doesn't laugh any more.
Oh, and our electric blanket stopped working right and I hit it, too, and then it worked. I don't have a clue why I don't hit my kids!