Let's take care of your bank feed issue by going through a few steps of troubleshooting:
You can also refer to this article: What to do if bank transactions won’t download or there's a bank error. Here' you'll find steps on how to fix specific error codes.
To keep your bank balance accurate, I suggest you import the bank transactions from your bank itself. View this article to learn how: Manually upload transactions into QuickBooks Online.
I'd also appreciate it if you could share the name of your bank. That way, I can check for any reported issues on our database.
Need additional help? Hit the Reply button and place your question in the comments below. I'll be sure to get back to you.
Having the same issue, seems to be a problem with Quickbooks and no resolve, causing much inconvenience and extra work!