I have a TP Link Archer be 400. I used to have an Archer c6. I connected three TVs to the c6 via Wi-Fi, and everything worked fine. Now, after replacing the router with a be 400, the TV set-top box doesn't show live TV. You can watch recorded broadcasts, the movie library, and anything else, but live TV doesn't work. Just a black screen. All the settings seem to be checked. Everything is OK via the wire. Can you tell me where the problem is and how to fix it?