I have the same problem with my HLS5087WX Samsung which is only about 2 years old. My TV Shuts down after 30-40 minutes of use with 3 blinking lights. first I thought the Lamp was the problem. I replacted the lamp... Then I replaced the balast to no avail. I called a technician to look at it, and he replaced the color wheel, but he now says the problem is not the color wheel but perhaps the optical engine/DMD unit. Anyhelp here.. ?