Hi, I just wondered if someone might be able to help advise me on my HS 110 smart plug. There is a rattle when the plug is shaken gently. I think it might be normal as another one identical had exactly the same issue. Is this a problem, should I take the plug back for a refund or just forget it and just use it. It works fine, it just had this rattle, sounds like it's coming from the led light. Thanks for your advice