In the past day, my MacBook has been behaving oddly. At random times, the screen will go totally dim instantly and without warning (it's as if I set the display to full dim). The display is still on sorta. I can barely make out all the windows I had open, just like if you dim it all the way, but it's unusable like that. I can then close the lid, wait a sec and open it back up. Anyone else seen this? I would note that I updated the firmware about 2 days back IIRC.