After a few hours of running ZP the GUI of ZPs main window is gone (where I can start, stop, add new projects, see schedule and log...). But the instance windows are still showing and the projects are also executed. When I end ZP via Taskmanager and restart, it works again for a while and then the same issues starts again...
I will send the report.zip to your support email. Please tell me, if you need some more logs or informations.