Well, I used the Lexar USB card reader plugged into the USB port of the Surface with the culprit Lexar card inserted.
I didn't run across issue.
Maybe the drivers on the Surface don't support such a fast read-access time on the card?????
Does Lexar have any driver solution they could offer in this case to improve compatibility?
As a check, I inserted my Phone's 16GB into the SD card slot and played some movies. Never unmounted.
At this point, would Lexar consider a refund? OR, if Lexar would do their own tests with their card and the Surface, I'd gladly take a replacement. Maybe the card is flakey..
Would be nice if a Lexar Rep. popped their head in here. Seems they've got a common issue going on with their cards and the Surface.
fwiw, that card works completely fine when used via an external card reader...which leads me to think it's a driver problem but i can't figure anything out...
i contacted m$ support and they tried to support but then they realised i'm running insider preview then told me to go to the forums.
They did say "if" i wasn't running insider preview they would try dism and sfc commands to check the system, so i manually did that, to no effect whatsoever.