MacBook Pro (Mid 2012 - Model: A1278) Random Shutdown on BATTERY ONLY!
I have a MacBook Pro ( 13-inch - Mid 2012 - 2.9 GHz i7 - Model A1278 ) that is randomly shutting down when on battery power. So long as the MagSafe is plugged in, it operates perfectly. But if I'm on battery power, it will only be a few minutes before it blacks out. Strangely enough, if I put the MagSafe back on it will reboot on its own (without me pressing the power button) and pick up right where I left off (i.e. all my applications that were running are still there).