Found another good source for creating a bootable USB drive Guide: How to Easily Create a Windows 10 Install USB Drive I found today while creating a win 10 bootable disk. With this instruction, I successfully installed win in a USB drive.
What's your laptop model and brand?
Edit: Try with turn off the computer and remove the battery and put the battery back and turn on your laptop.
May it helps.
Maybe a BIOS setting? In my BIOS I can set my computer to automatically restart when power is restored, of course, mine is a desktop so it doesn't have a battery, but probably worth checking.