I unplugged the modem, router and Roku. Left them off for about 10 minutes then plugged in the modem first, waited a couple of minutes, then plugged in the router, waited again for several minutes then plugged the Roku back in. Unfortunately it didn't work. Still getting KC local channels. Guess it's on the phone with Roku tomorrow.
...At this point I'm wondering if I made the right decision to cut the cord with cable.