If this is the primary reason for needing auto-save to work, I say rectifying this problem has a much higher priority. I use Cubase daily and I do not experience these crashes. I understand that it does not help you per se, but my point is that Cubase can run without crashing, which is probably more desirable than throwing a lucky dice on auto-save.
If this is the case for you, I would contact Steinberg Support so that they can help you. They’ll look at your crash dump files, whatever. You’ll learn what is causing the problems for you and likely something can be done about it.