Vizio LCD 37 Inch Turns Off Randomly. I have a 2006 Vizio 37 inch LCD that has started to turn

Question

I have a 2006 Vizio 37 inch LCD that has started to turn itself off randomly. Sometimes its within a few seconds of me turning it on, other times its hours into the TV being on. Sometimes it turns off once and then is fine and other times it will turn itself off several times in a row. I called Vizio and, of course, my warranty has expired. I reset the TV per their instructions and have changed power sources, but am still having the problem. Anyone have any solutions for this? Thanks, in advance, for any help you can provide!