My raspberry pi 4 was constantly booting into network boot i was like what the fuck is wrong with it.. I re-flashed its bootloader and i reinstalled the OS on my SD card and wasted 2 days on it.. as it turns out the real issue was that the shift button was stuck on my keyboard.. lol
@m0xee yeah probably.. it uses u-boot for several distors that i know maybe the bootloader also uses it.