Sounds bizarre even for me, but I wouldn't doubt it having anything to do with the network troubles a few of us seems to be having here locally.
Oh, and my friends are both on Comcast.
According to my system logs, the last entry before the reboot was 18:02 (of March 26th), which I've taken to mean that's when the system locked. The last entry in my poclbm-mod log file is 11:20:10 of March 26th, but I'm not sure what zone that is.
Yeah I thought it would have been some kind of a graphics card issue or a power issue, not a network issue, but I wasn't ruling anything out. I'm not new to computers, I guess I was just tired from being up for 2 days straight and wanted to share that weird happening :-P For us it happened around 1-1:30am EST