For the past several weeks, some clients are receiving duplicate invoice reminders. We do have reminders turned on, but they are going out a minute apart. Any idea why?

I appreciate you providing details about your duplicate invoice reminder concern in QuickBooks Online, @KC1986. I'll gladly help you get rid of the duplicates. 

Normally, sending reminders does not result in duplicate transactions. It'll simply include a PDF copy of the original invoice. To rectify the issue, ensure that no recurring invoices are scheduled for that particular customer. 

Here's how to check it:

1. Go to the Gear icon.
2. Select Recurring transactions.
3. Check if there's an active recurring invoice for that customer.
4. If you find one, select the drop-down arrow from the Action column.
5. Choose Delete, then click Yes to confirm the changes.

Once done, recreate your recurring invoice template. It's also possible that the previous template is defective which caused the issue. Here's how:

1. Go to Settings ⚙, then click Recurring transactions.
2. Select New.
3. Select the type of transaction to create, and then select OK.
4. Enter a Template name.
5. Select a Type: Scheduled, Unscheduled, or Reminder.

To learn more about the process, check out this link: Create recurring transactions in QuickBooks Online.

I'm also adding this article to learn how to design and personalize the invoices you send: Customize sales forms.

You can always get back to me if you have additional questions or other concerns by leaving a comment below. I'm always here to assist.