cubase 9 pro crashing since one day....never before

hello everyone
I cubase 9 pro on mac osx 10.11 (el capitain) with steinberg ur 44c sound card,

and two days that cubase closes unexpectedly, by chance I have to update the drivers of my sound card,??? and if you what and how should I do, thank you for the answer…
.is there some link for this…
thank ivan milan

I noticed that the crash only happens to me with the last project I am working on and not with the other old projects,

I also noticed that the latter last project with Cubase 9 pro precisely does not open but with version 8.5 it

and crazy all this and i’ve only been happening for a day