I have an 18I8 myself and all has been good here.
However sometimes all that is needed is a PC Reboot. or an Unplug/Re-plug in of your Focusrite device.
I have yet to have my drivers bit the shed. unless something got totally corrupt, I suspect something more obvious.
Like powering off the unit for 60 seconds or more (this allows a reset) and unplugging the unit.
Important: Also make sure you are plugging the USB in to the same port every time. (make sure its a USB 2 port).
It should be the same port you used when you installed the drivers. Don't mix and match the port every time, stay consistent.