Unfortunately I have not been able to reproduce yet, only happened once. I filled in a support form including e-mail, topic dropdown list, and body but needed to click away to settings before sending said report and AdGuard - the GUI instance (AdGuard.exe) not the service (AdGuardSvc.exe) - froze up. Doubleclicking the system tray icon caused it to switch to another screen for a moment but then it froze again. CPU usage did not appear to spike. Tried to repeat the steps but so far it hasn't been reproduceable, nor did Windows log an "AppHang" event to post. Maybe it's just an isolated incident will update if I can get it to reproduce again.