I suspect these 2 Samsung 64GB cards I bought are fake. I put them in my phone and it said they were slow and considering using a UHS-1 memory card. This is supposed to be a UHS-1 card. On the back of the card was a sticker that hid the real barcode.
SmartBuy Classic Series microSDHC 32 GB Class 10, R/W 25/30 MB/s, SD adapter
41 Review
Memory card Samsung microSDXC 256 GB Class 10, V30, A2, UHS-I U3, R 130 MB/s, adapter to SD
50 Review
Kingston microSDXC 64GB Class 10, V10, A1, UHS-I U1, R 100MB/s Memory Card, SD Adapter, 1 pc, Black
45 Review
π½ 512GB Samsung Evo Plus Micro SDXC Memory Card
40 Review