Hi casnaltd-gmail-c,
Thanks for reaching out to us here. I can understand the concern with your bank connection in QuickBooks Online, and how it can have a negative impact on your day. I would be happy to help!
I recommend logging into your bank's website and see if there are any notifications that require your attention. It's important to note that any updates or changes on your bank's end, will also need to be updated in QuickBooks, to connect seamlessly. If you need to update your sign-in information, follow these steps;
1. From the Banking section, click on the Edit on the blue tile for the connected bank
2. Select edit sign-in info
3. Re-enter your login details, and try again
If the issue persists, please don't hesitate to contact our Customer Care team at 1-855-253-1536 from Monday to Friday between the hours of 9 AM and 8 PM EST. They'll be able to review the issue in more depth and escalate it for further investigation with our Development team.
Feel free to reach out again, if you have other questions. We would be glad to assist!