For my X1, when I was playing, it turned off and on by itself, I did sent to Newyork (I believe this is headquater) for them to check and fix. They change new mother board, but still the same problem, finally, they find out that there are some lose connection of harness. It happened to all my friends who have X1. For Audya, it turn off by itself when I was playing, but did not turn on by itself, when it turned off, I still see the led of "Disk" button blinking but very dim, I turned off and on the switch again to turn Audya on. Recently, nothing happen again.