Try wiping the cache under Settings then storage. If that doesn't help then you might have to try the cache partition in the recovery menu.
-hold the volume down and power button until it reboots and keep holding onto it until a recovery screen shows up.
-using the volume buttons, select "recovery" then hit the power button.
-a screen with Android and exclamation point in a triangle shows up. Hold the power button then hit volume up
-go to "wipe cache partition" using the volume button then select it with the power button.
-it will ask again, just hit yes.
-once its done just select reboot system.
Also make sure on the last software since I believe it was an issue with 6.0.1 but fixed in 6.0.1