Focusrite software is known to have issues. I can only suggest you get another brand. I have the Motu M4 and only touched it once during the initial install. I set it and forget it because it works all the time everytime.
I’m not sure that’s the case Larry. Focusrite are probably the biggest selling interfaces in the world and seem to work for the vast majority of people. I had a Focusrite Thunderbolt interface until quite recently when I bought a new Mac that would no longer work with it. The Focusrite and its software was rock solid for over 10 years. I now have a MOTU Ultra Lite MK5. It has been unstable from day one. Even had the first one replaced and the replacement still has problems. It has improved somewhat since the last Firmware and CueMix driver update but it still isn’t a stable as my old Focusrite was.
I think every manufacturer can have some issues on some systems for some users and it’s really just a matter of systematically troubleshooting until you reach the root pf the problem.