There are units of these models where the tv intermittently shuts down. The Stand-By and Lamp LED’s are blinking then after several seconds only the Stand-By LED is active. The turn off melody sound is heard during the shutdown process.
This could be caused due to improper close position of door switch and thermal expansion of the Door Cover causes shutdown to occur. To fix the problem, try to remove and reattach the Door Cover. Then, put a piece of velcro on the inside, where the switch hits the door cover.
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