How do I fix my Samsung Galaxy Note 3 Neo's sound (it's too low)?

[AC Question]

I've been having a problem lately where the sound on my phone for everything from incoming phone calls, to text notifications, to the system sound is very low, and almost inaudible. Some days it's a normal volume and other days it's not. I went into the system sound settings and raised them all to the highest they can go but I'm still having the problem. I've also checked for a system update and my phone is updated with the most recent version.

 

[B. Diddy]

Try booting into Safe Mode, which temporarily disables all 3rd party apps. https://support.t-mobile.com/docs/DOC-11473

If the problem disappears in Safe Mode, then something you installed is causing the problem. You may have to uninstall apps one by one until the problem disappears. If the problem persists in Safe Mode, then it's more likely to be a hardware or firmware problem.