I have a problem with USB 3 and am out of ideas. I have a USB 3.1 hub with a bunch of devices plugged into it including my keyboard. When I copy files from the laptop to an SD card (even at USB 2 ...

First of all, restart your computer and see if the issue is fixed or not. If the problem was occurring due to a minor glitch, it will be fixed automatically after restarting your computer. Also, ...