Are you getting an error code?  The code 9999 error is happening all over for everyone.   You will have to either update your banking manually or wait for them to fix it.  Here is a post I wrote with how to do the manual import:  

Resolution for 'code 9999 error issue: 'missing bank transactions' available: Yes.

The code 9999 error 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 code 9999 error issue yourself by looking for a resolution described in the article. If it is a complex code 9999 error issue or you are unable to solve the issue, you may contact us by clicking here or by using other code 9999 error support options.

For more information about resolving issues related to code 9999 error in Quickbooks/QBO or to get support for the issue 'missing bank transactions', click the link below: