Downloading transaction of Unitus Community Credit Union (checking account)

Quicken can download 2 of our 3 accounts from our credit union, but it cannot download our checking account. If I try and link it, the message is there is an account already with the account number listed. I do not want to download it as a "new account" either. I have not had a problem doing this, however this started on Saturday. It shows "Error Code: 1006" in the details of the Update Summary. Any suggestions?Thank you.