My 60gb had that same problem before it finally crapped up. If it starts to freeze up often, make sure you back up your saves ASAP. It may be a sign of incoming YLOD. Sony may not even be able to fix it and have to send you a new one.
Note: mine was a 60gb NA ps3 so this may not apply to you.
"Dr. Tenma, according to you, lives are equal. That's why I live today. But you must have realised it by now...the only thing people are equal in is death"---Johann Liebert (MONSTER)
"WAR is a racket. It always has been.
It is possibly the oldest, easily the most profitable, surely the most vicious. It is the only one international in scope. It is the only one in which the profits are reckoned in dollars and the losses in lives"---Maj. Gen. Smedley Butler
