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I'm afraid the Sierra VM remained unstable, so I ended up moving to Fusion which solved it.
There are no external devices attached, I'm afraid.
Thank you for this.
I have a 6Gb Sierra guest VM (on 16Gb 2013 MacBook Pro Retina host running Sierra). The guest hangs frequently. CPU usage isn't that high.
I'm having problems installing macOS guests (using Sierra and Parallels 12). I get hangs during installation. I'd like to increase the RAM...