That happened on my last MBP I had. Its a "common" problem according to Apple Support. It's a special RAM that needs to be resetted. Dont remember the name of the RAM, something like SR-Ram or something like that. Call Applesupport if it happens again, they will help you resett it (Something like restart and hold down a key) and its done. Ez, but shortly after that it ****ed up the keyboard even more for me so I sent it back and waited for the new Penryn which Ive had sice it got released and I LOVE it.