Painter 2018 crashing on my cintiq companion 2 Windows 8

I've been working with photoshop for a couple of years now on my companion 2 and never had an issue. I just bought painter 2018 and it crashes intermittently. I try to save as much as possible but I can easily lose 10-45 minutes of work if I'm really going. It's very annoying. The backup files it saves along with the file I'm working on are useless. Thanks for any info you have.