Good day, SB_77.

I appreciate the detailed information about your issue with LOC. 

The unexpected behavior might be caused by a corrupted file. Running the Verify/Rebuild utility can detect data damage in QuickBooks Desktop. Here's how:

To verify:

1. Go to the File menu.
2. Select Utilities.
3. Click Verify Data.
4. Then select OK to close all windows. 

To Rebuild:
 

1. Click the File menu.
2. Select Utilities.
3. Click Rebuild Data, then select OK to close all windows.
4. QuickBooks will ask to make a backup before rebuilding your company file, select OK. 
5. Once the rebuilds are finished, click OK.

You can also check this link for more details about the process: Verify and Rebuild Data in QuickBooks Desktop.

I've also included here a guide on resolving any possible data issues: Fix data damage.

Keep me posted on your results after trying these steps. I'm here to ensure your success.