Try using a damp, very wrung out, washcloth with out anything but water (no soap/chemicals) and gently clean the power button and the eject button. Sometimes debris, dust, finger prints and play-do (if you have kids) makes it's way into the nooks and crannies
of the console causing the console to act strangely but in reality it thinks someone is pressing those buttons.
Another odd thing I have heard of is flourescent lighting in the room near the console can effect the console by random ejects and power off's. Try moving the console to another part of the room and/or ensure nothing flourescent is near it also including
radios and other electrical equipment (beside the obviously required TV).
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