I need to create a thread in case it helps (or at least informs) someone with my problem. I have three Roamio units. Two are on cable, one is OTA but has no channels within range. The sick Roamio can record from cable and content can be transferred or viewed on other TiVo or Mini units. It has been doing that for a while. But (as of last month) it can not accept content over Ethernet or WiFi from the other Roamio units. To clarify: it is running TE3 while one other is TE3 and one is TE4. The error has no number, just that there is a connection problem. It is wired into my router, but still fails when changed to WiFi. It has a 3TB drive that has never filled up. Built 30 March 2015 and activated 11/25/15. (BF). Other units are from BF in 2014 and 2017. All run 24/7 and have no heat issues. No MoCA. Other units are connecting with wireless bridges. Content transfer, etc., via Online work fine except for the error in the thread title. Open to suggestions or guess work. Looking for a Roamio with All-In but there's no panic. I have a spare from 2013, but I'm guessing (?) that a MB swap could lose the All-In on the bad unit and all content on the hard drive. Thanks.