Please provide more details.
What edition level (Starter Edition, Deluxe, etc.), version and release of Quicken (R xx.xx) are you using? Click Help / About Quicken (Mac: Quicken / About Quicken) to determine year/version and release. You must be on the latest release (patch) level for your supported Quicken Subscription version. If you're missing patches, update your software first. US, Canadian or other international version of Quicken? Is your subscription still active? Or is it expired? What version of Windows or Mac OS are you using? What error codes, error messages, symptoms do you get? What bank(s) are you having issues with? What account types (checking, savings, etc.) are you having issues with? Does this problem occur when you run One Step Update (Mac: update all accounts) from your desktop/laptop or when you initiate a download using the Quicken Mobile App or Quicken on the Web? What have you tried so far to resolve the issue?
If you haven't done so already, I'd say it's time to call Quicken Support on the phone and request help. Let them do a screen share session with you to review the situation on your computer, to determine the nature of the problem and to figure out how to fix it.
Quicken Support: