Lock unlock problem

What volume do you have your ringer/notifications set at? On my phone it has to be set to 4 or higher to hear the lock sound.
 
Some days ago my back ground notification work accurately but after reboot it doesn't work rightly 😞 please help me bro
 

Forum statistics

Threads
342,188
Messages
2,265,266
Members
428,859
Latest member
Menacer95