device randomly shutsdown without reason

Hello, I run ProxMox Virtual Environment 8.4.0 on a TRIGKEY Key-N150 Mini PC, Intel Twin Lake N150 (4C/4T, bis zu 3,60 GHz) Mini Computer, 16 GB DDR4, 500 GB SSD M.2 PCIe x4, Dual HDMI/Zwei LAN 1000M,WiFi5,Bluetooth5.0 Device It worked like a charm for 10 days, but now suddenly I wake up and...