Rush is so unstable and freezes/crashes ALL the time.....

I have been payng for and using Rush for years. Probably 4-5 years. In the early days it seemed ok, but far out is it unstable. To a point where it is almost unusable.
It freezes, crashes, doesn't save work. I am so fed up with this.

Sometimes I get a message saying "We ahven't been able to auto save your work in a while, exit and reopen the project", or words to that effect, and then it freezes when I do this.

Why has this app not been fixed after so many years?? This is really unacceptable.
I keep thinking about uninstalling and reinstalling, but I have some important projects I dont want to lose....