Help & troubleshooting for network issues, including connecting your device to your home Wi-Fi network, connecting to public networks, troubleshooting wireless issues & ethernet connections, and optimizing streaming performance.
I have (had) three Roku devices that worked with a moderate level of periodic dysfunction until I got a new cable modem. None of the three devices could find the modem's signal while my other devices (5) all connected without a hitch. I tried MANY times to find the signal and I contacted Roku support who refused to provide assistance. So, I bought a Fire Stick, connected it, and had no problem. The three Roku devices are in the trash and I will never buy another product from them.
Many times cable companies send out new modems with the 2.4 GHz radio disabled, only using 5 GHz. Only a handful of Roku devices support 5 GHz, so that might have been your issue. You might still check if that's the case, and most likely your Roku devices will still work fine.
Dan Ultra (4640), Ultra (4670), Ultra (4800), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.