Hello @Barbie Z
Thank you for reaching out to the Community regarding your issue, although I am sorry to hear that you are experiencing issues with your Bank of America account. It sounds like it might be getting stuck while downloading causing the issue. One thing we can attempt here is to see if we add the disable and re-link the connection. I'll leave steps down below on how to do so.
First, we'll try deactivating all of the accounts for the affected FI. You can do so by following the article listed down below.
https://www.quicken.com/support/deactivate-online-banking-services-quicken-accountOnce all the accounts are deactivated go ahead and follow the article here on reconnecting the accounts. You'll want to make sure you're using the add account option then linking to an existing account.https://help.quicken.com/pages/viewpage.action?pageId=3216277
Once you've done so please let us know if you're still seeing the sign-in popup. If so we'll see what troubleshooting steps we can attempt next.
Thanks,
Quicken Francisco