Why should I keep my computer cool?
If you notice that you’re able to play games fine for a few hours before you start seeing issues, this is a sign that your computer may be overheating. If your computer can’t cool itself, it may damage your hardware and shorten the life span of your PC.
If you suspect this could be happening, refer to your manufacturer's guide to check your computer’s fans and vents for dust or blockages that could prevent airflow.
If you are following the series of articles in Troubleshooting low frame rate (FPS) in Fortnite and this did not solve the issue try the next step in our troubleshooting: How do I update my video card drivers to fix problems with Fortnite?