What was that all about? The system didn't turn off, just put me back on the XMB. I tried getting the patch again and it worked. The game was Cuboid and I use a slim, if any of that is relevant. Could it have been an internet error?
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sometimes it's good to wait about 10-15 seconds before downloading a patch, since the game still runs in the background when that screen comes up and when you hit "OK", there's a chance that you do it while the game is accessing the HDD or loading something. It doesn't happen with every game and the worst that will happen is what happened to you, but still it's good to know.
At first I was like: http://i42.tinypic.com/2cid95j.gif ...But then I was like: http://i.minus.com/iUVnhKxM7l5DG.gif