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Please start by rebooting both the router, and the roku, by unplugging power to each for 60 seconds.

Then try the roku connection again.

If it still isn't working, check your network settings that it's using the correct network and password. If it is, or if it can't even see your network, but other wifi devices work, then you may indeed have a bad wifi radio in the roku. If it's close enough to your router, you can try a wired ethernet connection to see if that will work for you.