One of 5 linked bank accounts (same bank) stopped updating

Thanks for sharing the details of your concern, @Sharon007.

I'll help you with the process in syncing the correct accounts in QuickBooks. 

If your bank was linked to an incorrect account (newly created one), we can disconnect and inactivate it. That way, you can reconnect the correct one and download your transactions. 

Here's how disconnect an account connected to online banking:

1. Go to Bookkeeping and select Transactions.
2. Click Banking and click the tile for the bank account.
3. Select the pencil ✎ icon, then click Edit account info.
4.  
5. Check the Disconnect this account on save box.
6. Click Save and Close.

Once done, follow these steps to inactive an account:

1. Go to Settings ⚙ and select Chart of accounts.
2. Find the account you want to delete.
3. Click the Action ▼ drop-down list and choose Make inactive.

When you run reports, you’ll still see inactive accounts and their transactions. QuickBooks includes them to keep everything accurate.

Then, you can now reconnect your correct bank account to the Banking page. 

After QuickBooks downloads your transactions, you'll want need to review them to make sure they’re categorized properly.

That should do the trick! Please let me know how it goes by leaving a comment on this thread. I'd be glad to answer should you have any additional questions about the process. Take care and have a great rest of the day.