Hello there, Erika.

I'm here to give details on why recurring transactions aren't posting and how to fix them.

The recurring transaction stop working are caused by these reasons:
 

1. The recurring template isn't set to schedule.
2. The credit card associated with the recurring transaction may have been expired.
3. There's a problem with the recurring template.
    

Let us take a few actions to address this. First things first, confirm that the repeating template is scheduled and that its due date hasn't passed. It will also be possible for us to remove and re-create the previous template.

Here's how:

1. Go to the Gear icon.
2. Select Recurring Transactions.
3. Locate the template that stops working.
4. In the Action column, click Edit.
5. Take note of the details. You'll need it when recreating them.
6. Then, hit Delete.
    

Once done, you can recreate a new template. See the steps below:
 

1. Go back to the recurring template window.
2. Click New.
3. Enter the details of your template.
4. Then, select Save and Close.
    

If the issue persists, you can manually create a transaction using the recurring template. You can review this material for more detailed information: Fix failed recurring transactions in QuickBooks Online.

For your future reference, I've also included this useful article: Duplicate transactions when using a recurring template.  If you run into any situations like this, you may find instructions here on how to handle them.

Please reply in this thread if you have follow-up questions or additional query. I'll be happy to assist you.