Problem with notification sound

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http://forum.xda-developers.com – I don't know why this started but it is very annoying. My speaker works because I played music while my phone didn't make any noise and it worked. But when pressing the volume keys, the little "boop" doesn't sound and when I restart the phone, the animation and sound turning off doesn't sound but the boot animation sound works and everything is normal, at least for awhile anyway. Is there any way to fix this? Oh I'm all stock, no flashing or ROMs, anything. Sent from my LG-LS970 using xda app-developers app (HowTos)