How to reset Galaxy S8/S8+?

Q : On previous existing devices, to restart the device I was able to remove the rear cover and

carefully remove the battery. 

However I cannot restart my device using this method since battery for Galaxy S8/S8+ is

“embedded” or  within device by itself.

How do I restart my Galaxy S8/S8+ if device appears to be “frozen” or not responding when I

try to use the touch screen?

A : If your device is frozen and unresponsive, you may need to close apps or turn off the device and

turn it on again. If your device is frozen and unresponsive, press and hold the Power key and the

Volume down key simultaneously for more than 7 seconds to restart it.

If after restarting the device you still find your device freezes sometimes or is sometimes unresponsive,

there are some actions you can try to help correct this symptom:

If the problem is still not resolved, visit the Samsung Service Centre nearest you.