I've recently bought a 15" rMBP, and I'm experiencing freezing within applications. I'll be editing in FCPX, and the computer will freeze completely for about 3-4 seconds. I am working off a FW drive through a Thunderbolt adaptor, but I wouldn't have thought such an expensive computer would suffer such freezes. Has anyone else had this issue? What can I do to fix it? Any help would be greatly appreciated.