It's my pleasure to help you access the banking tab in QuickBooks Online (QBO). I can't see that there's another user experience this issue.
With this, let's perform some browser troubleshooting steps and get your banking tab working fine again.
Please access your QBO account through an incognito browser to help us determine if this is a browser-related issue. To access QuickBooks using a private browser, you may use either of these shortcut keys:
Google Chrome: Ctrl + Shift + N
Mozilla Firefox: Ctrl + Shift + P
Safari: Command + Shift + N
If you're able to access your banking tab using a private browser, you may need to clear the cache of the regular browser you're using.
If the issue persists, I suggest reaching out with our QuickBooks Online Support Team to check and investigate this further for you.
You may also read these articles to learn more about online banking: