My TV turns on and off constantly by itself?

My GE model 31GT740 started turning itself on and off constantly at different times throughout the day. Is it the TV or could it be the power strip? Nothing else on the strip is doing this. The TV is probably at least 3 years old but we got it from a family member so I don't know for sure. Anyone ever had this problem? It's gotten so we can't watch TV because it just keeps turning on and off!!