I have a Z3, everything works well, however in the last two months something wrong happens almost every day.
Whenever I speak on Fb Messenger or Viber over WiFi, my sound randomly disappears, my partner can't hear me. It can take a few seconds or much longer. Many times I saw, that the used voip app can't find a network, wifi signal is lost. I reset the phone, made software repair, so far it seems to me, it didn't change anything. I'm teaching languages online so it's a serious problem. Any other devices don't have this issue. Any idea?