Silly question folks. I exchanged my P4 for another P4 at Apple due to the gimbal making a little screech noise when I'm moving the drone around. Unfortunately, the gimbal still makes a noise. But, when I turn my P4 on, no matter what, there is a fan on underneath the body that's always on. I assume is cooling it's processor etc. However, I don't recall this being on in my other drone and looking at videos, I see others with the drone on and it's dead silent. I may be paranoid because of the issues I had previously. Anyone know if that's normal?