DJI support said it might be a bad USB port on the card itself. I went ahead and reinstalled it last night and did a reset for HDMI with the same outcome. This morning I installed the original card and the video stream is rock solid again. If everyone else has it working fine then it must be my card, but I think it's the firmware. I'm going to just return the card at this point and use the HDMI apple adapter until things are resolved. Thanks for the input!
BTW, the fact that DJI is telling people to try Android is ridiculous. If a device is supported, then they need to address that.