Hi,

This link may be of relevance to your problem.

http://forum.xda-developers.com/sprint-g...

You may also wish to try a hard reset of your phone to see if this resolves your problem.

Be aware that a hard reset will erase all your downloaded apps and user data and restore your phone to a factory default condition. It will be like when you first bought it.

You may wish to backup your data first.

Before performing a hard reset ensure that the battery is charged. Do not perform a hard reset with the charger connected.

Here is a link that shows you how to do it.

http://www.hard-reset.com/lg-g4-hard-res...

Be patient, it takes a few minutes.