All electronics go bad, but it's often ISPs changing settings in their customer's routers that cause problems. Since the 3900 can only connect to 2.4GHz channels, make sure the wireless mode is set to b/g/n in your router. What error code do you get when you try to connect?
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution."
If you appreciate my answer, maybe give me a Kudo.
I am not a Roku employee.
