I use my Roku almost exclusively for SLING and occasionally for Roku channels.
Lately Sling keeps dropping or I get the busy "wheel" the circle as it's trying to stream a show. I also get the network error messages as well.
It is NOT a Sling issue as I stream Sling on my laptop with no problem AND the Roku channels have the same issue.
I ping Google's DNS server 8.8.8.8 to see how my traffic is and when the Roku engages the time for the packet jumps into triple digits from 16 or 17 or 21 to 200 something so I know it is the Roku stick and nothing else.
Any ideas?
Perhaps a Firestick?
And when I do a ping, I do a persistent pig (using the -t qualifier) so I can monitor the jumps and traffic.
Try this to renew Roku connections:
If that doesn't fix it, try disconnecting the power to your Roku for a few seconds. When it comes back up, see if you then can set up the network connection.