Powernode doesn't appear on Tidal speaker icon after pause

My powernode has been working fine controlled by Tidal until recently when after a pause, Tidal screen is unable to locate powernode.  After taking out the power plug of the powernode, Tidal will see again the Powernode.  Have tried resetting the router as described by Bluesound, such as waiting for at least 5 minutes before plugging the router and Powernode etc, didn't work.  Help appreciated.