Tried with another cable? Can you reinstall one of the games with the latest version of the
DBI and
sys-patch running on your Switch and take a screenshot of what it says on the screen? If everything installed without an error I doubt that the cable is faulty.
I've been using SanDisk Extreme for a while now and had no issues with it. Not sure if Nintendo licensed microSD cards are any better. All microSD cards can fail over time and sadly the only way to check that is by running the
h2testw and see if it'll run into an error.
Maybe. The only safe way to remove it that I know of is if your Switch is turned off. Maybe there's an option in hekate as well under USB tools, I can't remember since it's been a while.