is there any dust left in your WII U ? in order to protect it and prolong its life , i advice u use a protector , such as Aluminum Finished Snap-On Hard Case Shell Cover for Nintendo Wii U GamePad to keep it clean and put it in a right place, when u use it u should give it enough room and let it release the heat
I don't understand, and it has nothing to to with the Gamepad, it's the Wii U that makes the noises.