Always Boot into PXE – Stuck in Boot Loop with FOG

[FrankB]

Hello everyone,
I have a big problem with FOG, but maybe it’s a small one for you.
My FOG server is running without any issues. When I go into the BIOS or UEFI, I can set the boot order to boot from the network, and everything works fine. The system boots into PXE, and I can inventory the machine and start the deployment.
However, after the machine has booted once via PXE, it always boots directly into Linux Mint. The boot order in UEFI then changes automatically. When I select GRUB as the boot manager and try to PXE boot again, the system gets stuck in a loop and keeps counting down “Boot from Disk.”
What am I doing wrong, and what do I need to do to always boot into PXE?
Best regards,
Frank