Hello: I have been flying the Phantom 1 for several months without any problems. Today, after plugging in the battery, it goes to a slow blinking yellow light and stays there. I tried plugging into the NAZA-M V2 Software and for the compass readings it was 0-0-0 and was not showing live figures. However, gyroscope and acceleration xyz were working just fine. Also, I can enter the compass calibration mode, but I cannot complete it successfully. Do I need to replace the compass? I did not find anything that explains what the slow blinking yellow light means. Thank you for any suggestions.