How to Force Reboot Galaxy Note 5

Unlike the previous models of galaxy note series this one comes out without battery, there for it freeze it will become not responding. we can't just pull out the battery. Samsung engineers, of course, already thought of this, so they added one key combination that when performed correctly, the device will perform a simulated battery disconnect that will forcibly reboot the phone.
To do this, simply PRESS and HOLD the Volume Down and Power keys together for 20 to 30 seconds or until the phone reboots

Among the problems that may be fixed by this procedure are:

• Frozen phone
• Unresponsive device
• Very sluggish performance due to constant freezing
• Unresponsive due to app crashes
• Got stuck during boot up and became unresponsive, etc.
• How to start Galaxy Note 5 in Safe Mode

The Safe Mode is the first fail-safe procedure you can use to diagnose a problem. Once the device has booted up in this mode, all third-party or downloaded apps would be temporarily disabled leaving pre-installed and core services running.
Turn off the phone completely.
Press and hold the Power key.
Once the phone shows, release the Power key and immediately press and hold the Volume Down button.
The phone will restart but keep the Vol Down button pressed.
Once the phone has finished restarting, ‘Safe mode’ will be display in the lower-left corner of the screen.

You may now release the Volume Down button.
Now that the phone is in safe mode, you can…
Continue your troubleshooting
Use your phone without third-party apps