Macbook Pro 17" (Mid-2009) Randomly Getting Stuck in Sleep Mode when Unplugged

Hey guys, this is my first time posting so please excuse me if I do anything wrong. Here's the issue:
I have a Macbook Pro 17" (Mid-2009) that has had an issue with the whole computer shutting down at random, but only when unplugged from the MagSafe power adapter. Upon scouring all the forums and discussions I could, I haven't found anyone with the same exact circumstances as myself, hence this post. Let me explain.
Many say it's a battery issue. That can't be, because this has been happening for months, and after I finally got my laptop repaired a few days ago, it still occurs. I had sent it in for a logic board failure, but consented them to fix any other parts that weren't functioning properly. Upon the return of my machine, I found that they installed a fresh hard drive, new battery, new logic board, and a new speaker on the right side. This must mean that neither the logic board nor the battery are the issue.
What else can this point to? Again, it only occurs when the Mac is unplugged from a power source, and it doesn't totally shut down. It goes half way, essentially stuck in sleep mode. The white indicator light on the front freezes, and the power button has to be held to fully turn the laptop off, then pressed again to reboot. It can last anywhere from a single minute to a few hours before shutting off again, and it's always the exact same circumstance, no matter what kind of computing I'm doing at the time.
Note that while no one else has found the solution to lie within resetting the PRAM or SMC (in the discussions I read), I still need to try that tonight and see if it affects anything.
Thanks in advance,
Sean

Macs are having problems with SSD drives. The root cause is the OS X journaling file system. The Apple-written SATA controller driver can saturate the bus at times, inhibiting performance. Some manufactures are even selling special "Mac" versions of their SSD drives that are slowed down on purpose to compensate for this problem. Unfortunately, the problem still exists in Snow Leopard, from what I've read.
Also, I read that Apple has secretly slowed the recent new laptops down (3.0GB/s to 1.5GB/s) to compensate for the problem.
Dave M.
MacOSG Founder/Ambassador  An Apple User Group  iTunes: MacOSG Podcast
Macsimum News Associate Editor  Creator of 'Mac611 - Mobile Mac Support'

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