Split blacks out/ power off during flight

Please check from the below three aspects:

1.  Current input to split;
Please power up the Split via USB by a phone charger (5V 1-3A) to see if it works properly. If it does, it indicates the problem is caused by insufficient power. Please then try to change your power setup to PDB BEC /FC.

2.  The connection between the 3pin JST cable and Split's main board. Please check and make sure it is stable and try to fix it with tape if there is looseness. 
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3. You may also try another card, please refer to Which type of microSD card is fit for RunCam Split?.