I've had a bit of a frustrating issue on my 2011 MBP recently. The computer will randomly during tasks (in various applications) freeze up the entire computer. Keyboard doesn't work, time on mac stops, applications and all computer operations seize, except for trackpad movements (but I cannot click on anything). I am forced to restart everytime this happens! Does this sound like a hardware or software issue? What would you recommend I do? Any tips would be greatly appreciated!