I have two Mi Home Gateways, both configured independently from each other in different networks / locations / Mi Accounts. Both worked without any problem, but sice a few weeks both have one problem. Normally when you turn on /off alarm, there is a sound. Now this works not always any more. Also the alarm sound itself. It works again after plug off / on the gateway from the socket, sometimes for a couple of days, sometimes for hours only. Does somebody have the same problem / knows how to solve it?