Why does my gas fireplace turn off after 30 minutes of use?

There could be several reasons why your gas fireplace turns off after 30 minutes of use. It could be due to a safety feature that automatically shuts off the fireplace to prevent overheating or gas buildup. It could also be a sign of a malfunctioning thermocouple or pilot light. It is recommended to have a professional inspect and service your fireplace to determine the exact cause of the issue.