I was on the search page just now and the HD box rebooted. I had reviewed the TV results of my search and had moved to the On Demand section. Nothing was displayed; at the bottom where it usually shows the number of results, it said "searching". I clicked Exit, right arrow and a few other buttons on the remote to try to get off of the page but nothing was happening. Finally, "boot" appeared on the HD box display and it rebooted. What could have caused a spontaneous reboot? Or was some work being done on the network at that time?
Thankfully, I wasn't recording anything at the time or watching anything I couldn't miss a few minutes of.