So I have a Phantom 3 Advanced that I purchased last month. Lately I have been having problems with it not flying straight, and it keeps drifting to the right. Furthermore, the gyroscope indicator in the bottom left of the dji go app shows that the quadcopter isn't flying level either. After landing the drone I have noticed that the rear left rotor is warmer than all of the others which leads me to believe that this could be a rotor issue. I have replaced all 4 propellers, I have done several remote controller and IMU calibrations, as well as compass calibrations and nothing seems to fix the problem. Any suggestions? Is there any way that I could definitively determine what is wrong and how to fix it? Thank you.