Vizio 32 inch lcd tv menu keeps popping up?

Brand new out of box vizio 32" lcd tv has problems. First had trouble getting it to turn on. Finally the menu came up, we set it up, and sat down to watch movie. All through movie, menu to choose input kept mysteriously popping up. Choose the proper input, and continue. Randomly back. Finally finished movie, turned it off. Turn back on and now the menu above that is up constantly flipping through the choices. If you try to do anything, the choose source menu comes up and flips wildly through the choices, ignoring all input. Only way to get rid of it, turn it off. Show is showing while this is going on, so it does apparently know there is input coming to it. Any ideas if there is say a software upgrade for this? If not, going to have to return it and will upset the person who gave us the gift that it doesn't work. Any constructive input appreciated.