We appreciate you for being here in the Community space. Let me provide other steps to update your bank transaction in QuickBooks Online (QBO).
Before anything else, may I ask what is your financial institution? So we can check for any ongoing issues related to your bank. Adding additional details will help us deliver an accurate solution.
In the meantime, we can check if it's a browser issue by opening your account in a private window, as it ignores historical data.
Here are the keyboard shortcuts:
Safari: Command + Shift + N
Google Chrome: CTRL + Shift + N
Mozilla Firefox: CTRL + Shift + P
If this works, we can clear the browser's cache to ensure the program performs efficiently. Consider switching to a different supported browser if you get the same result.
I've also added this article for other possible error codes or messages on the banking page: Fix bank errors in QBO.