Review on Amplim 64GB V90 UHS-II SD SDXC Card: Lightning Speed, 300MB/S, Secure Digital Memory Storage for Pro Photographer and Videographer by Jordan Weakland

This SD card is unstable. I have to constantly format and reformat in my Sony A7R3. The problem is that when you take pictures, you can't view them. You may be able to view 1 but the second image will not appear. The camera displays an "Unreadable" error. I contacted Revain and Got Sam support in Uruguay. He refused to give me any documents other than these and was a very poor customer service representative. I'm done with Revain if this doesn't get resolved. I want a refund for this unwanted item.