General complaining abuot "Cubase is unstable, Cubase only crashes, etc." helps noone. Before you complain, follow the following suggestions:
Install only the OS and Cubase on a second drive (no drivers, no 3rd-party plugins, etc). Is it still unstable? If not, then something else is causing your crashes! Install your drivers one by one test and restart you system between each install. Note the install order. If Cubase becomes unstable after you've installed, let's say "x1.vst".
Remove all plug-ins. Now reinstall "x1.vst". Is Cubase still unstable? If yes, this plug-in is not fully compatible with Cubase. If not, then proceed and install and test the other plug-ins on your list in the reverse order, until Cubase becomes unstable again with, let's say "y1.vst".
Now remove all 3rd-party plug-ins again and reinstall "x1.vst" and "y1.vst". Is Cubase still unstable. If yes, you've found the cause "x1.vst" and "y1.vst" are incompatible with each other. If not, you may need to test with adding other plug-ins between "x1.vst" and "y1.vst" on your list. Sometimes a combination of 3 or more plug-ins are needed to cause the problem.
I am sure that the majority of crashed that Cubase is blamed for is actually caused by rouge 3rd-party plug-in.
And this is most important. Is the problem repeatable?
Yes, this is quite a bit of work, but you'll find the real culprits. There is no point in bantering on Steinberg or Cubase for problems caused by someone else. A clear description of when, and what actions you took when the problem occurred, help others (including Steinberg's engineers) to help you. General ranting does not.
Hard-drives are dirt cheep these days so there in no reason not to have a spare test-drive lying around.