There are reasons this could happen and some things you can do to prevent it. The vents on the cord end of the tool are air intake vents. Keep those open and unblocked. The vents on the front or nose end of the tool are output vents. The air that is running through the tool has to escape through those vents. You may actually hold the tool near those vents, but we discourage you from wrapping your hand around the tool in a way that would COVER those vents. If you're holding the tool like a pencil, consider the use of a Detailer's Grip so you have optimal control and airflow. You may also consider the Flex Shaft Attachment – it take the weight of the tool out of your hand completely. If you're holding the tool more like a golf club, move your hands back slightly so they're on the body of the tool, not over the vents. It's also important to consider what you're doing. For example, to complete a task like cutting, you may be running the tool at 35,000 rpm, contacting a material that gets hot easily – like metal, and there's a lot of heat being generated. Having full airflow through the tool is really important. If you find the tool is really warm when you go to turn it off, consider letting to run for a minute with no contact on the material. This will keep the air flowing through the tool without generating additional heat from the application.