Hi there, jb20147. I understand how inconvenient this is. I want to ensure that we take this matter seriously.

I checked on our list, however, there's an ongoing investigation about Custom Transaction Number Setting automatically turning on (INV-97820) and there are no specific updates at this time. However, our engineers are working together to gather a resolution as quickly as possible. 

With this, I recommend contacting our support team for you to be added to the list of affected users and receive email updates.

Here's how:

1. Log in to your QBO company.
2. Select Help (?).
3. Click Contact Us and choose a way to connect with us:

• Start a chat with a support expert.
• Get a callback from the next available expert.

In addition, you can check out this article for you to learn how to record invoice payments in QuickBooks Online.

Please leave a comment below if you have further questions regarding the custom transaction number setting. Take care.