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.
Kingston microSDXC 64GB Class 10, V10, A1, UHS-I U1, R 100MB/s Memory Card, SD Adapter, 1 pc, Black
45 Review
Silicon Power Elite 64GB microSDXC 2-Pack Memory Card with Adapter for Nintendo Switch and Wyze Cam
57 Review
π½ 512GB Samsung Evo Plus Micro SDXC Memory Card
40 Review
Smartphone Xiaomi Mi 8 Lite 6/128 GB, midnight black
70 Review