New network modem and router connectivity issue

i have a new Arris router/modem and Tablo works fine when i hook it up to the modem with an ethernet cable, i.e. hard wire, but when i try to disconnect it and use WiFi, the Tablo isn’t found through Roku. i keep getting Search Again. Any ideas? i have tried a couple of disconnect and reset combos but none seem to work.

When you connect the Tablo to the router, can other devices connect to it? Say your phone, computer?

Did you follow these instructions? I am not sure you can connect the Tablo via WiFi using a Roku. Might have to use a PC or iOS.