I got a Z3 about a month ago and it has been working fine for me until last weekend when I realized it had no sound. I did a restart thinking it was a minor thing and it started working after the restart. The next morning I noticed the same issue has happened again. Another restart fixed it. The issue came up again and I did a hard restart. The issue still came up after a while. I later did a full format of the phone, yet the issue still occur. I am running the latest officially released update of the OS. I really do not know what to do as the phone is useless to me right now. I cannot neither hear via the speakers or even headphones. All controls work properly.<br>Please any ideas will be appreciated.