kp-51hw40 flashes blue and shuts down with 6 blinks

My sony kp-51hw40 after about 30 to 40 minutes it flashes blue about three times, 5 min or so in between and on the third time the set cuts out. I recieved 8 blinks. When the set is in a room that is cold it stays on longer  all night sometimes but onc i move it to a room that has heat  it again did the blue flashes and then shut off. ( not sure if it matters but when This first happend I got 8 blinks)