I got news today, my PC is repaired, and they will send it to me. I thought it was the GPU, but this was in the mail:
Diagnosis: The device has a defective electrical component. (Mainboard)Cracked / peeling / corroded / melted (Fan / Cooling) A software problem was detected. (Operating system software) Repair Description:The following component was replaced. The device's software was updated to the latest version. BIOS update performed.