@Wayne-TP 

Thanks... I've just done that and hope it will be sorted...

  @Wayne-TP 

Thanks. My devices were OK this morning but I've taken the precaution to unlink and relink again as suggested. I did not know whether I had to do this on my husband's phone as well. He and I share the Tapo account but both have our own Google accounts in our Google Home app. I have only done this on mine so shall see how this goes.