Same issue for me after upgrading to parallels 13. just started today even though I upgraded last week. VM stops responding and then crashes. Windows apps stay active for a while but then stop responding. Osx and mac apps are fine. Parallels 13.3.2 + osx 10.12.6 + windows7. Just tried allocating more RAM to the VM (from 2gb to 5gb of 16gb) so we'll see if that helps. nothing else really to tune in parallels. this is really annoying.
!!!Found a sol'n from Parallels tech support: Go to Apple logo > System Preferences > Energy Saver, then turn OFF the 'Automatic graphics switching' checkbox.!!!
Last edited: Jul 26, 2018