Random shutdown problem after replacement of new MB

i got the replacement of my MB one month ago due to the random shut down problem. the symptom before the replacement was not only random shut down but also that the MB could not be turned on once a while.
now it's been one month after i got the replacement from apple store, there is no randon shutdown at all, but when i got up this morning, i couldn't turn it on. i tried several times, but it just turned out to be dead. any suggestion about what i'm supposed to do? shall i ask for a refund or a replacement? i'm just afraid of that i would get a defect model again.

thanks for both replies.
i usually close the MB when the shutdown is completed, i know the shutdown won't be completed if i close it right after i shut it down.
and also, i got a whole new mb as a replacement from apple store rather than having it repared and just the logical board replaced. and it's really weird, since it was said the new logical board doesn't have whatsoever problem. i also read some news on tuaw or infiniteloop (i forgot which one it is), the RSS is not really caused by the faulty logical board, it was the heat sink melt by the high temperature coming from the intel processor which shortcut the circuits around it. now i'm totally desperated. it looks like unless apple drops the stupid intel chip, otherwise the RSS will never go ever.

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