Do you have Xfinity as your internet provider? If so, your problem may have been caused by a recent update to many Xfinity-supplied routers:
Xfinity users report the router configuration needs to be switched back to b/g/n security. If you don't have access to your router settings, you may have to request Xfinity to do this for you.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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