Testcomplete not responding while trying to commit a Dialog (Win10 Desktop Application)

My guess is that the various "Next" buttons are actually Next buttons on a redrawn form.  Basically, you click "Next" and then the form reloads and you click "Next" again and so on.  What is probably happening is that the automation is running faster than the application can handle it so one of your "Next" clicks is happening on the previous button.  You might want to build some delays into your automation to detect when the next form is displayed before proceeding through the test.