sd card error

So I just bought a used phantom 3 standard and I have been using a 64 gb SD card with it. However sometimes when I fly it says there is no card installed in the camera even though there is. But other times I have no problem. Is this a problem any one else has encountered? Thanks

My problem When turning on phantom 4 with sandisk extreme pro 64 gb v30 xc1 I get video signal until the fan starts up then the image signal is lost. This is what I get after this happens no image transmission 0x800020 error Gimbal disconnected 2 red then 2 green fast blinking gimble lights. No...