1. The input current of Split Mini could be not enough with the decrease of battery voltage on the flight. If PDB/BEC/FC/VTx can't supply enough current to Split, this issue will happen. The average working current of Split Mini is about 650mA while under 5V input. So please make sure the input current is enough for it to work normally. It is better to power your Split via dedicated BEC(5V >=1A) / PDB(5V >=1A)/ FC(5V >=1A).
2. Add 2-4 layers of tapes to the metal cover to make the ribbon cable connection steadily:
3. Please wrap several layers of acetate cloth tape on the ribbon cable of the camera side (wrap 1-1.5 mm of the total length is enough):
This will make the camera case hold the ribbon cable steadily.
4. Make sure below screws are screwed tightly：
5. Please open the camera part camera to check the connectors to see if they are well connected:
If not, please add a piece of thin tape to the ribbon cable' s connection part to sensor board:
6. Please check if there is any damage on the ribbon cable:
7. Make sure the writing speed of your microSD card is high enough. Please refer to Which type of microSD card is fit for RunCam Split 1/2/Mini?
8. It also might be caused by shaking of your Quad:
1) Please mount on new props，or change to other brands, refer to goo.gl/nEY316, #807 and #808;
2) Adjust PID, refer to goo.gl/o121wP
3) Calibrate the Throttle Range of your ESCs, refer to goo.gl/7z8rCV
4) Soft Mount motors, refer to goo.gl/JYGLEQ
5) Upgrade the firmware of your flight controller