Faults are everywhere, and any drone may have minor or unforeseeable problems. When these problems occur, it depends on how you handle them to avoid more losses. Here are some common minor faults, including problems that may occur with DIY drones:

1. Outdoor GPS hovering is not stable. There are two main reasons for this. One is weak GPS signal, which can hold the position but not well enough. The other is the GPS component itself, which means that the GPS is outdated or the manufacturer's optimization algorithm is not strong enough.

2. The drone drifts in circles when hovering and the circle becomes larger. This can generally be attributed to compass interference, and in most cases, calibrating the compass can solve the problem. If calibration does not work and the compass readings are still abnormal after several attempts, then it's important to consider environmental factors, such as the presence of strong magnetic fields in the area. If the compass readings are abnormal only in a specific area, it can be determined that the environmental interference is significant in that area. If the compass readings are abnormal in any area, then the compass may be faulty and needs to be repaired or replaced.

3. The drone flies away uncontrollably during GPS hovering. This is commonly known as "flyaway." If the drone is completely uncontrollable, it can be assumed that the compass has been severely interfered with, making it impossible for the drone to determine its orientation. In GPS hovering mode, the drone itself will not feel any changes in its position. In this case, switching to attitude and altitude mode will allow you to regain control and manually fly the drone back.

4. Free-falling in the air. Free-falling in the air can occur in two situations. One is when the drone loses power and falls uncontrollably, which is mainly caused by battery failure or depletion. The other is when the drone has power but still free-falls, which is more common with quadcopters. This occurs when one of the four rotors fails to provide enough power, causing the quadcopter to lose balance and crash.

5. Body shaking and jittering during flight or hovering. This is more common with DIY drones. The solution is to check the motor installation angle. When the power is not sufficient, even a slight deviation in the motor installation angle can easily cause this problem. Also, PID overshoot in the flight controller can cause this issue. For folding arms, check if the arms are fully extended and if there are any severe looseness.

6. Tilt during takeoff. There are several reasons why this may happen. Check the accelerometer, gyroscope, motor installation angle, motor speed, remote control channel values, and propeller direction.

7. Unable to take off, even with full throttle. Check the battery level and propeller direction. The drone cannot take off without sufficient battery power, and it also cannot take off if all the propellers or motors are installed in the wrong direction.

8. Automatic return. Check the battery level. If the battery level is too low and low battery return is set, the drone will automatically return home. If the battery still has power and the drone still returns home automatically, then pay attention to environmental factors that may cause signal loss between the drone and the remote control. The drone may also activate the failsafe and return home if it loses control due to environmental interference. Additionally, check if the remote control channel values are normal. Errors in the remote control channel that controls the return function can also cause the drone to return home automatically.