I have a 500 meg expander drive from Western Digital attached to my Roamio. While moving my TV, the cable from the WD to the Roamio came unplugged, generating an error message telling me to plug it in and reboot the Tivo. During the reboot I got this message: "The TiVo Box has detected a serous problem and is now attempting to fix it...." It only took a few minutes instead of the expected three hours, and now works properly. I'm concerned that there is something wrong with the box, and I can exchange it for a new one if necessary. Can anyone provide me with some guidance about what has happened, and if I would be better off exchanging it for a new one. Thanks to all.