If the blade is getting hot it needs changed out or sprayed with cooliant. It means the motor is hot and not good for the clippers. On my old cheap clippers I can't do more than 2 dogs before it gets hot.When my friend grooms my dogs, she is careful not to lay the blade flat against the dog's body because the razor does get hot. She holds it at an angle so only the tip of the plastic guard is in contact with the dog.