I found this:
https://www.windows-commandline.com/clear-archive-attribute-from-command/
So open Notepad, paste in:
for /F %i in ('dir /s /b directory_path ') do attrib -A %i
And replace directory_path with your drive letter. So if your sd card shows up as F: in my computer, it should look like...
Sounds like you have the file archiving check on your files. You can remove this on a mac by running "sudo chflags -R arch" in a terminal, not sure the Windows equivalent .
There's no way to load XCI files through an external drive right now. Also no word on being able to sort XCI files into separate folders, maybe in the future.
More likely you chose to install the .nsp games to your SD card from within Devmenu. So of course it's gonna throw errors when the SD with the games isn't in the system.
Class 10 and UHS 1 are around the same speed, no worries there. MicroSD cards have a limited number of times you can write to them, if your card is old it might be reaching the end of life and be time to replace it.
It sounds like you have a failing or counterfeit SD card. Use the Panasonic SD Formatter, it should automatically select the best cluster size and try again. If it's still freezing you need to replace your SD card.
http://av.jpn.support.panasonic.com/support/global/cs/sd/download/index.html