Hey guys, I have a 2011 macbook pro with 8 gigs of ram and I'm running dual hard drives, my OS is on a 256gb SSD and storage on my stock 750gb hd. My computer has run everything amazingly for over a year, running almost 24/7. It still runs everything amazingly at great speed, but my only problem is it will lock up after approximately 15mins-1hour, where it will continue to do whatever it was currently doing, whether playing a song etc, but won't allow any new commands such as opening a program and such. Just get the "rolling rainbow wheel" icon. It will stay in this state until I either reboot, or it will eventually go to the grey screen that has the Folder with a question mark icon on it. As soon as I reboot it runs great for another 30 minutes or so. Occurs in both os x and bootcamp win 7 with exact same symptoms. Haven't reformatted yet since it seems like a hardware problem as it happens on both mac / win. Anyone experience these symptoms before? Any help would be GREATLY appreciated.. THANK YOU! ---------- Forgot to add I already blew out the dust in the rear vent / speaker holes, and removed both fans and cleaned them out. I also installed a temp monitoring / fanspeed software and it read relatively high on the graphics card, however it could be bugged. Do these macbooks have a history of requiring thermal paste reapplication?