The router is near the Roamio, but not the Mini. The Mini's in another room. I might have ethernet cables long enough to run it as a test, but wouldn't be a permanent solution.
On the router settings page, I see this under ' Broadband Connection (Ethernet/Coax) Properties'
Router Tx (Mbps): 235.00
Router Rx (Mbps): 249.00
and when I click 'go to WAN Coax stats' I see this
Router N/A 235.83
ONT 249.65 N/A
Nothing odd about the coax wiring as far as I know. Just moved into the apartment and had the coax installed Saturday. The ONT was here previously, but the tech had to run cable in the bedroom. The ONT is in the bedroom closet, has a "2.0 MOCA Splitter" which runs one to the TiVo Mini in the bedroom and a second through the wall into the living room where there's another "2.0 MOCA Splitter" that goes to the router and to the TiVo Roamio.