Hello, @Mark H.

I know how important it is for you to get your bank transactions downloaded in QuickBooks. I can share some information about this issue.

There are a couple of errors you might encounter when using WebConnect. We have an ongoing investigation about it and our banking team is working to get a permanent fix for this unexpected behavior.

It’s also possible that this error has something to do with how the transactions are imported from the bank since the information we receive comes from them. You might want to check with Chase to verify.

I’d also suggest getting in touch with our Customer Care Team to have your account added to the list of affected users. This way, we’ll be able to notify you through email of any updates. 

Here's how to contact support: 
1.    Go to: https://help.quickbooks.intuit.com/en_US/contact.
2.    Choose your QuickBooks Product.
3.    Select your QuickBooks version.
4.    On the Contact Us page, click a topic.
5.    Click on the Get Phone Number button to get the contact information.

Please let us know how it goes after contacting phone support. If you need anything else, leave a reply below. I’m always here to help. Take care and have a great day!