My next suggestion would have been to restart the router - so much for that. If you have other network equipment involved like a "gateway" or modem you might want to try restarting them as well. I think the "no channels" problem has to do with an Internet connection issue, but that's based on my being able to replicate the problem sometimes by disconnecting the Ethernet cable to my Ultra and rebooting it. It's not a solution, but if you have an alternate network available like your phone's hotspot try connecting to that to see what happens. If the channels on your Home Screen return then that would confirm that it's some kind of network problem.