QuickBooks Pro 2021 desktop closing on it's own

I got your back to help you sort things out and help you with this unexpected behavior in QuickBooks Desktop, NP-L.

I've checked here on our end and there's no reported case where customers encounter an error message when signing in and out in QuickBooks Desktop Pro 2021 or 2022. To better isolate this one, we can run the repair tool to resolve unexpected behavior of the software. Here's how: 

1. Create a back of your company file to avoid any accidental data loss.
2. Reboot the computer and tap the Windows Start menu.
3. Look for Control Panel on the search field or select it from the list.
4. Tap Programs and Features then Uninstall a Program.

If you don't see Programs and Features, select Programs instead. Then choose Program and Features. Let me show you how: 

1. Pick QuickBooks from the list of Programs, then press Uninstall/Change.
2. Hit on Continue or Next. then Repair.
3. Tick Next again then wait for the tool to start its diagnosis.
4. Press Finish when done.

Here's the article that will give you more info about the steps: Repair your QuickBooks Desktop for Windows. Once the repair is done, you have to run QuickBooks as Admin. To do so, right-click the QuickBooks icon on the desktop and hit Run as Administrator.

If the same thing happens, just run the Verify Data tool which self-identifies the most commonly known data issues within a company file. Once done, run the Rebuild Data to resolve data integrity issues. Here's how to Verify data: 

1. Choose Window then Close All.
2. Verify Data. Choose File then Utilities. 
3. Tap Verify Data. If you see:

• "QuickBooks detected no problems with your data," no further action is needed.
• A specific error message, there may already be an article for it. Try searching for it on our QuickBooks Desktop support site for specific instructions.
• "Your data has lost integrity," indicates there is data damage in the file. Continue to the steps below to Rebuild Data to correct the problem.

Then, rebuild data by following the steps below: 

1. Choose File, Utilities then Rebuild Data.
2. You will receive a warning message to back up your company file, press OK. A rebuild requires a company file backup beforehand because in rare cases the process may need to delete transactions or list entries to fix the file. A backup of your company file will ensure you have a secured copy of your company file before any changes are made to it.
3. Choose where you want to save your backup, then tap OK at the bottom of the QuickBooks Desktop Backup window.
4. Press OK when you get the message "Rebuild has completed".

Visit our QuickBooks Help Article page for more insight about running your business in your account.

Feel free to update us after trying the steps, as I want to ensure this is resolved for you. Please leave a comment below and I'll get back to you. Take care always.

At least in some cases, this is a new behavior from releases this last summer, seemingly related to QuickBooks new third-party open-source freeware embedded browser, which appears to be buggy.

We've had good luck with this solution, which also seems to turn off unwanted ads:

How to Stop QuickBooks Desktop Advertisements & Crashes