Might want to check out this thread:
I recently purchased SanDisk Extreme Pro U3 V30 XC I card, however when I insert it in the
Mini 3 it tells me the card is too slow. I tried recording 4K video @60fps and on the computer it look very choppy. I then inserted Samsung EVO Plus U3 card. I did not get a message stating the card is too...
mavicpilots.com
According to the link to the user manual provided in that thread:
Here are the recommended cards for the remote:
Recommended microSD
Cards for DJI RC Remote
Controller
SanDisk Extreme 64GB V30
A1 microSDXC
SanDisk Extreme 128GB V30
A2 microSDXC
SanDisk Extreme 256GB V30
A2 microSDXC
SanDisk Extreme 512GB V30
A2 microSDXC
SanDisk Extreme Pro 64GB V30
A2 microSDXC
SanDisk Extreme Pro 256GB V30
A2 microSDXC
SanDisk Extreme Pro 400GB V30
A2 microSDXC
SanDisk High Endurance 64GB V30 microSDXC
SanDisk High Endurance 256GB V30 microSDXC
Kingston Canvas Go Plus 64GB V30
A2 microSDXC
Kingston Canvas Go Plus 256GB V30
A2 microSDXC
Lexar High Endurance 64GB V30 microSDXC
Lexar High Endurance 128GB V30 microSDXC
Lexar 633x 256GB V30
A1 microSDXC
Lexar 1066x 64GB V30
A2 microSDXC
Samsung EVO Plus 512GB microSDXC
Are you using this SD card?
Capture more action in Full HD and 4K UHD video with your DJI camera drones. SanDisk Extreme microSDXC™ UHS-I cards are built tough for extreme durability, even under challenging environmental conditions. Buy now at the DJI Store!
store.dji.com
Where did you get the card? Is it possible that it's counterfeit?