Same problem here. Phone has KitKat on it and has exhibited this exact same problem. So far, no solutions.
Your phone should have Lollipop on it. You have outdated OS software.
You should clear your phone's cache.
Power down phone
Press/hold volume up and home keys, then press/hold power key
When phone vibrates, release power key
When system recovery menu displays, release volume up/home keys
Use volume keys to navigate to wipe cache partition and press power key to select
Once finished, press power key to reboot system