This is the information I have for 324 and 106 errors:
106, 168, and 324 occur if the account has been closed at the bank and therefore no longer shows up on the website.
Try a manual update using the steps in KB 6290: http://support.qbo.intuit.com/support/answers.cfm?faq_id=6290, Information about automatic and manual […]
Resolution for '324 or 106 issue: 'error code 324 or 106' available: Yes.
The 324 or 106 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 324 or 106 issue yourself by looking for a resolution described in the article. If it is a complex 324 or 106 issue or you are unable to solve the issue, you may contact us by clicking here or by using other 324 or 106 support options.
For more information about resolving issues related to 324 or 106 in Quickbooks/QBO or to get support for the issue 'error code 324 or 106', click the link below: