My NBA league pass won't play any live or video content, has been fine until yesterday, tried firestick, ipad and android none work but when I switch off WiFi and use 4g all is fine! I also took it to my sons on his wifi again all fine. Any help please ?
Sounds like a conflict between the NOW Router and the App.
First things I would try is go into your NOW account and changed the Broadband Buddy age Settings, if that doesn't work try unplugging the power to the Router for around 20 minutes to allow it to automatically acquire a new IP Router address.
If still no luck, then go into the NOW Router webpage Settings and see if disabling IPV6 makes any difference using the App.