I saw this for the first time on Saturday. I was recording something off FOX Reality and all of the sudden the thing kicked into a reset. I believe it normally does so after a software download but my history did not show one in quite some time.
Mine has been intermittently locking up and restarting since Saturday. I have a feeling mine is damaged thanks to our power company. We've been having a lot of brown outs due to the increased use of air conditioning. It's to the point where it won't turn on until the power has been disconnected for an hour.
On a hunch... do you guys have yours connected to the internet? I'm going to disconnect mine tonight and see if that changes anything.
Mine has reset 3 times in the last week or two. From what I have been told, this is a known issue and has to do with the last firmware update on some HR-20-100 and 700 units. There is a thread on this issue at the other site.
I suggest you all join the Cutting Edge forum. There are links to it on this site and dbstalk.com. You can download beta releases in a 3 hr window on weekends. I've had great success (maybe 2-3 bad releases) over a year's time. If the national release is causing reboot issues, then try the latest Cutting Edge (beta) software.