Is your ISP a cable company? They have a habit of changing settings on users modems, and occasionally those changes can cause problems. In this case (Roku is still connected to the network), there might be a security setting in your WiFi that is blocking connected devices for seeing each other. Look in your WiFi security settings and see if it is now enabled. If your WiFi is labeled as a "guest" network, that setting is most likely enabled, and on a guest WiFi it should remain that way.
Dan
Roku Community Streaming Expert
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