It's a long standing bug in the hub. Try pushing the WPS button and see if it settles down after a few minutes, as it is believed to be associated with an incorrect WPS wait state or something similar. Other users have reported this, the most reliable fix is to use paint, nail varnish or thick tape to cover the green lights. Black gaffer tape or black electrical insulating tape can be applied to leave a smart finish if the hub is somewhere visible.
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