I appreciated your effort in figuring out the steps, @BeardElectric.

I'm going to show you how to get rid of the reminder that keeps popping up in QuickBooks Desktop.

By heading to the Preferences tab, we set reminders off.

Here's how:

1. Go to Edit and choose the Preferences tab.
2. Under the Reminder section, click the Company Preferences.
3. Find the Overdue Invoices and set toggle it in the Don't Remind Me column.

Alternatively, I recommend double-checking and rebuilding your data. It can assist in the resolution of data-related challenges.

Here's how:

1. Go to the File menu, then hover over Utilities
2. Select Rebuild Data.
3. On the QuickBooks Information window, select OK. Follow the on-screen instructions to save a backup.
4. Let the tool repair your file. 
5. When the tool finishes, select OK.
6. Go to the File menu.
7. Hover over Utilities and select Verify Data.
8. Let the tool check your file for data issues.

In addition, kindly read this link for more information on how to resolve data difficulties on the program:  Fix data damage on your QuickBooks Desktop company file.

Please let me know how it goes or if you have any follow-up questions about reminders. I'll be here if you need further assistance.