Should the fan come on for a second or two every time you power up your P4? I just bought a second P4 and the fan comes on for a little bit right at power up. My older P4 which has been sitting outside for a couple of weeks (don't ask LOL) is not making the fan come on at power up. I just flew the older one which has been outside in weather for 2 weeks and it's flying perfect. I of course did a fresh IMU cal and a gimble cal. It's flying perfect but I'm not sure about this fan issue! And help def appreciated.