have a MBP the nov 2010 model.. running updated OSX lion. never had a problem until the other day.. was browsing web and everything froze. got the beach ball.. ugh.. some how i got it to a blank dark screen and beach ball. took it to genus bar.. when i got there it was still blank screen and beach ball. the guy did the option P R on thing whatever it is.. it turned on and he ran some tests and it was all fine.. shrug today i was doing mail and it froze again. this time tho i was able to power it off and then back and now ok... whats the problem and how to fix? will it keep getting worse?