An outage can cause a surge in a network similar to an electrical outage. It is less likely than an electric outage, but yes it can happen. Some surge protectors have surge outlets to protect network lines and cable lines as well as electric plugs. If you haven't tried this, try unplugging the Roku, the modem, and router for 1 to 2 minutes, then plug modem back in, wait, then router, wait and finally the Roku. If that doesn't help, see if you can go into the Roku network settings and forget your network and try setting it up as if it was new. A last resort would be factory resetting.
