It started with a subtle, constant heat radiating from the upper right-hand side. She called it "Surface Type 4 HOT"—a fever that made the tablet too warm to touch, causing the fan to whine like a jet engine, yet it still sluggishly rendered her 3D models.
Go to Settings > Updates & security > Windows update > Check for updates. Use Surface Recovery Image: If the OS is corrupted, use a USB recovery drive from Microsoft Support to reinstall the system. Binkdx9 Surface Type 4 HOT- Download