I guess the e-mail notifications aren't working properly, because I didn't get any notification for your reply.
Of course I did enable it, and the stop time is the default value (10 minutes). I have the Automatic USB Disk Assignment setting disabled, immediately above, may these settings be related?
Yes, I am using gigabit. The only non-gigabit device linked to our network is the ADSL router, which is connected to the Internet port of the Buffalo router.