Tv shutting off without warning

My Samsung dlp tv is shutting off without warning. Not all the time and not when I first start it. I have changed lamp,large fan and color wheel with oem parts. Worked fine for a month then started failing again. Any idea's

The tv shuts off completely and the light blinks for a few moments then it can be turned back on. And usually fails again. It was suggested that I reset the bulb. I did that and the tv didn't turn off for two days. Then it failed again today. Should I still check the boards how do I find out which board is the sms board