My 2012 rMBP keeps restarting itself whilst on Sleep Mode.

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so i've had rmbp 15" since nov 2012, first time round, had pixel drop on screen , took apple replaced. ssd randomly went, point when start folder '?' sign, took genius bar , reset , checked , there no hardware problem.

today, past couple of days...i've had laptop consistently restart when goes sleep. i've reset power save settings default, verified disk permissions, repaired disk partition , on, yet still continues happen. still have applecare of course, don't want drive 30 miles fixed again. i'm running 10.10.1 yosemite on it, 256gb ssd, 8gb ram etc.
seems because adopter might have got faulty model has had quite few issues it, i'm kind of frustrated because it's become 6 monthly occurrence whereby goes wrong it. :(

edit: also, other day, had on charge, , when went use, took power adaptor off, didn't want start until put adaptor on. after took off , ran on battery fine.
 



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