Not sure whether this should be posted in the OS X Yosemite Section, or here. But my MBP, is constantly shutting off, as if it is losing power. It used to be that after a while of using it it would do this, but had gotten to the point of doing this as it starts up. After a few tries I can get it to Safe Boot but that also inevitably shuts off. Not sure whether it's my Logic Board going again (this would be the third time which is ridiculous) or if it's Yosemite. Even the recovery partition does this.