Diagnosis
The projector is in High Brightness mode or the ambient temperature is triggering aggressive cooling. The laser light source generates significant heat.
How to Fix It
Lower the brightness setting. Swipe down from the top of the Android TV home screen to access Quick Settings. Tap the brightness icon and select ECO mode. Verify the air intake (on the sides) and exhaust (rear) vents are completely unobstructed.
If That Didn't Work
Check for a firmware-triggered high-speed fan cycle. Go to Settings > Device Preferences > About > System update to check for and install any pending updates. Some early firmware versions had overactive fan curves.
Heads Up
Sustained loud fan noise followed by a sudden shutdown indicates thermal protection. Immediately turn the unit off and let it cool for 30 minutes in a well-ventilated room before next use.