@pittmeans is your ISP a cable company? If so, they might have changed something in your modem/router that interferes with a Roku connection. On the 2.4 GHz radio there is something labeled "Mode". Some ISPs have been setting the Mode at G/N. There's another setting labeled B/G/N, and for some reason some modems will not work correctly with Roku devices with the Mode set to G/N. It needs to be B/G/N. Also, if they've changed the channel width to greater than 20 MHz, that too can cause issues.
Some ISPs will let the customer change these settings, while others lock them out. If you can't access those settings, you will need your ISP to change them for you.
Most Roku TVs have a dual band WiFi radio. Since most WiFi routers use the same SSID for both radios, you might not be connecting to the best radio. Also, while the 5 GHz band is less crowded, there are some channels that Roku devices will not see. These are labeled DFS Channels, and they are numbered between 49 and 148. If your 5 GHz radio is using any channel between those two numbers, your Roku won't every try to use 5 GHz. So you could check that as well.
Dan
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