Update: After reading several pages of forum postings, the consensus seemed to be to disable any servers you aren't using and then reset to factory. I decided to look over the server settings and noticed it took forever for the iTunes server to refresh. It eventually got stuck at 38% and then froze the unit. Not sure why I turned this on in the first place - my DNS-321 is for backup only. Funny enough, I can't disable the iTunes server unless it refreshes to 100% so I'm stuck with going back to factory settings.
Did all that and reconfigured and kept the iTunes server disabled - everything is working again.