Thought I have not read every page, this thread may hold a few clues: MacBook switches to hibernation during sleep
One obvious suggestion, since you did not mention it, is to reset the SMC:
Before Resetting the SMC
Try each of the following steps in this order before you reset the SMC. Test the issue after completing each troubleshooting step to determine if the issue still occurs.
- Press Command + Option + Escape to force quit any application that is not responding.
- Put your Mac to sleep by choosing the Apple () menu from the upper-left menu bar and then choosing Sleep. Wake the computer after it has gone to sleep.
- Restart your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Restart.
- Shut down your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Shut Down.
Resetting the SMC on portables with a battery you should not remove on your own
- Shut down the computer.
- Plug in the MagSafe power adapter to a power source, connecting it to the Mac if it's not already connected.
- On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
- Release all the keys and the power button at the same time.
- Press the power button to turn on the computer.
The only reasons for this behavior that I can think of are either that the battery is essentially dead and can't support the system on its own, or that the SMC is so darn fokked up that it THINKS the battery is in such a condition.
We could go on and on with 1001 conjectures and things to do, but the fact remains that the computer is still in its one year base warranty (or even more, if you purchased AppleCare), so it is Apple's problem to make it right. No sense in beating our brains silly over this problem.
And while on the subject, if you did not purchase AC and seeing all these problems, may I suggest you do so in case you plan on keeping the Mac for more than a year. You need to have AC activated before the base warranty runs out.