I have the same issue. Noticed it last Thurs 12/17.

Kept trying multiple times daily to connect to CNB through QBO. No luck.

Spoke with customer service on Mon 12/21, was advised to try logging out/logging in, and ultimately to disconnect my bank feed and attempt to reconnect. Now I'm flying blind with a disconnected bank account and no way to do basic tasks in QBO.

Spoke with a customer service rep today Wed 12/23 and still got no clear indication from QB Customer Service as to:

a) what is causing the issue

b) if the issue is on QB or CNB's side

c) when this will be resolved.

I was generously offered 50% off my next three months, but I am now going to spend my Christmas manually exporting all my data to Xero and fully cancelling QB.

The best part is that to export my data from QB into a portable format, it requires me to use Internet Explorer. Upon logging in to QBO and going to the migration page in IE (typically I use Chrome on a Mac), it fails to load the export page and just shows a blank screen.

The sheer level of idiocy is astounding. Fix your nonsense, Intuit. I'm gone.