My drone all of a sudden gives me a message saying the processor is overheating and begins to RTH. I have taken the top cover off and the fan seems to be perfectly clean. I have updated it to the latest firmware. While updating the firmware, the fan seems to be going to full throttle. When I try to fly it, the fan does come on but not as powerful or as frequently as it used to. Has anyone been able to fix this issue without sending it in? I use my drone for work and can't really afford to wait weeks..