I have a Phantom 4 Pro. It has a 64 GB Sandisk Extreme microsd card. The buffer is set to 16GB. My issue is it only records 4GB films at a time then starts another video. I am recording in 4K/30FPS. I am not taking pictures and the card is clean and formatted. It does this with any of the MicroSD cards I try. Any suggestions to fix this and run one continuous recording? Thank you in advance.