Hi Mark17, while Parallels Development Team is working on the permanent fix, please disable hybrid shutdown as a temporary workaround:Here's my report ID: 102770614
1. Start Parallels Desktop.
2. Launch virtual machine.
3. Create a snapshot: from Mac menu bar choose Actions > Create snapshot.
4. Press command button to bring Start menu and type cmd.
5. You will see Command Prompt in suggestions, right-click on it and choose Run as Administrator.
6. In Command Prompt type powercfg -h off and hit Enter/Return.
7. Check the behavior.