Mac host is unstable running Windows 7 in Parallels 14 on MacOS 10.13.6 High Sierra

My Mac has rebooted mysteriously several times per day since installing Parallels 14 a week ago, mostly when recovering from sleep whilst guest Win7 VM is running. It happens in Coherence mode and standard mode. And it is a full bare metal reboot of the host OS with no warning whatsoever.

I'm running a fairly locked down corporate standard image Win 7 install, which I created under Parallels 12.

My Mac is a fairly ancient (3 y.o.) MacPro Retina 2015 13 inch with 8GB RAM, 2.7GHz i5 CPU and Intel Iris Graphics 6100 1536MB (presumably shared memory).

And i'm running two external monitors 1080p monitors, plus the Mac screen in 'Default for display' resolution. Graphics performance seems fine.

I've run the sp_correct.reg fix using elevated privileges, which fixed the message about shared folders. And I increased RAM available to the VM to 4GB (from 3GB). Its been more stable since taking these actions an hour or so again, but I thought it worthwhile posting here to determine whether i'm a uniquely unlucky user, or whether this is a common issue. I couldn't find anything in the forums or help site under the search term 'host unstable'.

 

Approx 24 hours later, and the sp_correct.reg seems to be working. No forced reboots since running that registry fix. Head to this kb thread on how to do it. https://kb.parallels.com/au/123990

 

Well i spoke too soon. Exactly after committing the above post to the aether, it happened again, and has just happened a second time since running the registry fix.

So all in all, the regsitry fix has reduced the frequency, but by no means completely solved my issue. I'm going to try to downgrade to v13 and return my system to stability, and will watch these forums for any indication that Parallels v14 is sufficiently stable to try again.