Hello there. I must say- Amazing stuff here.
Just had a one question. My Riggs sometimes restarts and when they do, after restart they enter in bios because the USB isn't recognized. I have to manually replug USB and then it boots up again.
I have a AsRock h110 BTC+ board and a 3.0 16gb usb stick
If you haven't tried this already, go into bios, under the "Boot" tab you have setting for "Fast Boot", set this to "Disabled". You can also increase "Setup Prompt Timeout" to 2 or 3 seconds. If that doesn't help you would have to try another USB stick (or buy the cheapest SSD).