Thanks!
Mine shuts down normally but it doesn't start, either if it is after a shut down or a reboot. When I check in bios, the usb is not in the bootable options. I have to create another bootable usb each time, on a different usb stick.
Also, when the system is eventually started, I can see the bootable usb as "usbshare2". I can also map it to my windows pc.