Might as well read this link and disconnect the account, there have been ongoing problems with cap one for weeks and weeks

Cap one, no direct connect after 12/31/17.
https://community.intuit.com/articles/1638552

Resolution for 'Capital One bank issue: 'Having issues downloading transaction from Capital One bank? Just started a week ago.' available: Yes.

The Capital One bank issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the Capital One bank issue yourself by looking for a resolution described in the article. If it is a complex Capital One bank issue or you are unable to solve the issue, you may contact us by clicking here or by using other Capital One bank support options.

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