To wipe the cache partition, follow these steps:
 
1.Turn off the device.

2.Press and hold the Volume Up key and the Home key, then press and hold the Power key.

3.When the Samsung Galaxy Note5  logo screen displays, release only the Power key.

4.When the Android logo displays, release the Volume Up and the Home key ('Installing system update' will show for about 30 - 60 seconds before showing the Android system recovery menu options).

5.Press the Volume down key several times key to highlight 'wipe cache partition.'

6.Press the Power key to select.

7.When the wipe cache partition is complete, 'Reboot system now' is highlighted.

8.Press the Power key to restart the device.