Funny, (or not so funny) I had the same issue around the time Julie did.  My Roamio was acting wonky, but my mini struggled to do anything.  I would reboot it, and it would work for awhile, then the following day, it would act crazy again.

The mini is in my bedroom, so i didn't really worry about it too much...It went on like that for a little over a week..I finally completely disconnected it from the network, rebooted it, contacted TIVO service and it's worked ever since..

I noticed the following day that I finally got everything working again, that I had HBOGO and few new apps available on TIVO.

My question to you folks, do you have those new apps on the TIVO service?