I have never seen this on my mac: a sudden shutdown with a freeze of 5s before that. No classic "crash screen" in many languages, just a sudden black screen and restarting automatically. TWO times in 30 minutes. The only thing I was doing for the first time was using my USB 3G adapter in a train on battery power. It's an Icon 225 from Option, I'm using the latest software from Option and the latest firmware (did a firmware upgrade to un-simlock it) I already used this USB 3G adapter without any problem, but it was not on battery (or very shortly only) and in a static place (maybe the roaming from one BTS to the next got the software crazy?) So, here is my question: is it possible that it is a software error, and is it necessarily a hardware problem? I couldn't find out in the console any relevant message: it just suddenly shuts down, and then I have all the boot messages. Next time I'm in the train, I'll try with launch2net software, just to see if it makes any difference.