TV suddenly goes to 'sleep' and then the view timer red light in front starts to blink. Previously in the past 3-4 months, I will unplug the main and restart successfully.in maybe 30-45 minutes. However during the past 2-3 weeks, the unplug time has now become longer and the last one was almost 12 hours. We tried playing on the timer settings on the remote but nothing still. The TV is about 10 years old and probably some parts need to be replaced. Thank you much.