I have a 5+ year old 50" Samsung DLP Model# HLN507WX/XAA. After 10-20 minutes of the TV being turned on, I am getting a bright flashing on the screen. Seems to increase in frequency the longer the TV is on. Definately some component heating up as it will stop if I turn it off, wait a couple minutes, then turn it back on again. Any info or ideas as to what is causing this would be appreciated.