So I got my refurb rMBP last week, and I have really enjoyed the performance of the machine - and of course the screen is amazing. However I did have two issues, one really weird that I wanted to see if any other rMBP owners have had. It took me a while to isolate this! Basically, if I'm running on the Intel gfx card, my computer will freeze up after a random amount of time (typically less than 30 minutes) running any one of the following: Videos in QuickTime Music in iTunes Video in Safari (hulu, youtube - both flash and html5) Video in Chrome (hulu, youtube - both flash and html5) When it freezes, everything stops. No error message, just can't move the mouse, no kb input, etc. If I had the sound on, I hear the last half second of sound repeated endlessly. Only solution is to hold the power button down to shut it off. Tried a complete wipe and reinstall of OS to rule out 3rd party software, still happening. Does not occur in safe mode, I suspect maybe safe mode locks nvidia gfx on? Tried SMC/NVRAM resets. Checked Console each time, no reoccurring messages leading up to freeze. AHT comes back clean, even running multiple extended tests - so a really weird issue. Does not occur if I force OS to use the nVidia card, just the Intel. The reason I'm asking - I'm going to return this machine and possibly just spring for a new one, because I like the machine so much, but I want to make sure I can watch a video on the thing for more than 30 minutes without it seizing up! The other issue is a clunking noise from inside the machine when I move it around - I suspect batteries were not fastened down based on the hefty feel of whatever it is moving around in there. So it's definitely getting returned, just want to double check with others regarding the weird freezing before I shell out an extra $600 for a new one!