I am experiencing a strange problem with my TV. It will be working fine, then shut down and give me the 3 blinking lights. All I need to do to get it to turn back on is press the power button once and it comes back to life. This happens at intermittent moments with no regular pattern. It can happen right after I turn it on, or after it is warmed up. Is it possible that the bulb is going bad or is it something more sinister. I don't want to replace it if I don't have to. Thanks in advance for any help.