Guess warranty doesn't cover "late tests", lesson learned, always stress test your machine on the first day with the right tools to be able to return rather than talking directly to the possibly incompetent manufacturer. I'll just keep it as a headless server unfortunately, not what i really paid for but eh . Also not sure what 3 years warranty means. Good day.
Bump, I'll rephrase:
My NUC keeps crashing on GPU load, I reset bios and OS, what should I do next?
Edit: I'll contact support instead thank you all.
TBH I don't recall ever seeing anyone posting positive experiences using these for anything with a heavy GPU load. That said, mine finally started to behave. I play Just Survive on it from time to time and it seems to do okay. I also use the unit as an NVR for a handful of IP cameras during all that.