I have been testing to see what issue is causing my iMac late 2014 27" to freeze every morning. This issue has been ongoing since I installed High Sierra. I had a support ticket open with Parallels and they said it's an Apple issue. I have narrowed it down to the issue being with full screen. If I have full screen on my Windows 10 VM, it'll freeze the entire computer. I installed teamviewer on the mac side to see if I can access it, but when it freezes, the computer is not able to remoted into. This issue goes away when in Coherence mode, as I've been testing every other day to see if I can replicate. When I use Coherence mode, there are no issues, I just really don't like using it. Has anyone else had these issues or something close to it? Did about all the troubleshooting I could with Parallels support.