If you ever enabled wireless on your Roamio even briefly then that is likely the problem - a conflict between wired and wireless networks. TiVo didn't provide an "off" setting for wireless for some stupid reason, so you need to effectively disable it by providing wrong password for wireless SSID. You can check your router for wireless clients to see if Roamio is connecting wirelessly or not.
Roamio Pro, Elite, Premiere
Cox - Motorola CableCards & TAs
Slingbox 350 via TiVo Mini & TiVo Stream for remote viewing
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