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Event ID 6008 entries indicate that there was an unexpected shutdown
Critical thermal event indicates that the problem is related to one of your hardware components not functioning properly that is triggering the computer to shut down
Check if your CPU is overheating. Also check if the heat sink or fan is functioning properly
get a good cleaning done for the fan and heat sink with compressed air only if you’re comfortable. Otherwise seek the help of a technician.
In addition, since power supply plays a major role in cooling the computer’s innards check if PSU (Power Supply Unit) is functioning properly.
Other thermal events (depending on your board) can be from the graphics card, bridge chipsets or hard drives
You may opt to check for third party Thermal Event Monitor software so that you have a brief idea as in what’s triggering the critical thermal event.