First, we suggest reviewing an article that describes the number of API calls to expect from Riva Cloud or Riva On-Premise: Salesforce API limits: Connection to CRM Server failed: REQUEST_LIMIT_EXCEEDED.
You have 10 users, with a total of 7 modules enabled, with a 15-min sync cycle during peak hours.
If a user did a bulk import into Outlook, the above count would be much higher.
Tip: The best way to perform an import is to use the Salesforce bulk loader tools.
Article ID: 586
Last updated: 28 Oct, 2016
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Riva On-Premise - CRM Sync -> Manage Riva On-Premise (Admin Guides) -> CRM Systems -> Salesforce -> Errors & Troubleshooting