A client is using Quickbooks Desktop Pro 2021 and having the same issue with shutting down when trying to switch between company files.  The program shuts down intermittently when trying to close a company.   We worked with Quickbooks support, who then told us they are aware of the issue.  She received an email from Support that the issue was resolved and to update the program, but this referred to the 2023 version.  There is no recent update for Pro 2021 as of yet.  From reading through this thread,  it sounds like people are experiencing the same issue with Desktop 2023 with no resolution either.  It would be nice to be able to find a fix for the issue as it's happening on multiple computers for at least two-three months.