Hi Photosinthas,
Thank you for reaching Microsoft Community. Apologies for the inconvenience this has caused you.
One of the tips to maximize battery health of the Surface devices states: "Devices that are charged or operated at high temperatures will cause accelerated aging of the lithium-ion battery and permanent loss of battery charging capacity. Surface devices are designed to work between 32°F and 95°F (0°C-35°C) so keep your Surface out of the sun and don’t leave it in a hot car.". See: Caring for your Surface battery (microsoft.com). Does the rooms or place where you used the device with high ambient temperatures exceeds this parameters?
When the device shuts off, does it show the thermometer icon before it shuts off and when try to turn it back on immediately? Or will it just immediately turns off?
The issue may be caused by the room temperature where the device is used especially if it exceeds way higher than the recommended 32°F and 95°F (0°C-35°C) but kindly try running these steps below to make sure that the device has all the updated software and drivers it needs to perform smoothly then observe if still the issue persist:
1: Run Surface Diagnostic Toolkit
See: Fix common Surface problems using the Surface Diagnostic Toolkit (microsoft.com)
2: Check for Windows Update
Go to Windows Settings > Update & Security and select Check for updates
Make sure all updates need are installed including Optional updates
3: Update drivers and firmware
Check what is the current OS Build of your Windows version by going to Settings > System > About.
Go to Download driver and firmware for Surface, choose Surface Pro
Then click the link next to Surface Pro 8 then click Download on the next page.
Choose the .msi file that matches your current OS Build and click Next.
After downloading, run and install the .msi then Restart.
4: Run System File Checker Tool
See: Using System File Checker in Windows (microsoft.com)
Hope this helps.
Kind regards,
Marrion