6.02 was fairly stable for me. Upgraded to 6.03 and started getting random crashes on projects that were fine before. Often the error messages would mention the VideoEngine. I also would get VideoEngine error messages when closing down Cubase.
I went and disabled the various VideoEngine exe:s and the dll in the Components folder and now everything seems really stable so far. I’ve worked on two separate projects for at least eight hours straight on each without a single glitch.