I am not experiencing the mount unmount problem on my Tmobile S8 and I am using a simple Evo 64gb Class 10 card. I did notice that putting the card in the tray was pretty difficult. I really hard to push the card into the tray cutout compared to my S7 in which the card just laid in the tray. In fact I started thinking my tray was defective because the card fits very tightly. Does anyone else notice this? Or maybe I got a version where Samsung made the tray tighter?
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