We have certainly experienced problems where a MIDI keyboard or other MIDI device is flooding Dorico with MIDI data, which then ends up choking the application and making it unresponsive. Can you try following the steps on this page and zip up and attach the results of the Snoize MIDI Monitor process? Also, please do Help > Create Diagnostic Report from Dorico’s menus and attach the resulting zip file, which is saved on your desktop, to a reply here too.