My Roku Ultra is wired to the router but the router often cannot see it or drops the connection while I am using it. It then takes multiple reboots of everything before the router recognizes the Roku again.  I've tried different ports & different cables, but same issues.  The port lights up as soon as I connect the cable, but the router interface does not show the connection.  This also happens with a SIP device, but never happens with my printer. If it is a Roku problem, then why does it happen with the SIP device at the same time?  Seems like a router problem.