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Providing you have a working connection, including all your wifi devices it's nothing to worry about.
There have been many, many posts on the forums regarding this. It's a bug in the hub3. You can sometimes get rid of it by either rebooting the router, or pressing the pairing button afor around a minute. Lot's of people have resorted to using black tape to hide the flashing wifi light.
The Service you do for others is the rent you pay for your room here on Earth - Muhammad Ali