QB Issue Resolution:
We can download and run the QuickBooks Install DiagnosticTool. This tool is designed to automatically identify and fix issues with .NET Framework, C++, and MSXML, and component related issues which cause the program to freeze.
I’ve found an article with detailed steps along with several recommendations you can try: QuickBooks Desktop won’t open, has stopped working, or not responding
Resolution for Issue 'Quickbooks starts and runs well but will not shut down. The screen freezes and goes grey blank.' available: Yes (Solved).
Source: Intuit Community forum.
Quickbooks starts and runs well but will not shut down. The screen freezes and goes grey blank.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.Support for grey blank
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Error Recovery for grey blank [Canada]
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Additional Support Options: