What is a "splendid lock" guys? My wife and I have updated our 5zs with every update and they have become worse with each one. We use life360 which now sees almost nothing. We both use bluetooth earphones most hours of the day and the bluetooth service is now no where near as good as it was when we got the phones. It appears the only idea on this forum is a backup then factory reset. You should not have to do that every time an update occurs. We loved our zenfone 3s. These are a nightmare... Our next phones unless asus ups its game will be made by someone else.