Hello,

Our SalesForce application is suddendly slow (several minutes to perform a query or an insert) and sometimes fails.

We are getting a lot of periodic failures and slowness executing api calls against salesforce.  
The exception we are getting back is: An unknown repository error occurred

We use a C#/.NET API to call the SalesForce App. The API uses the System.Web.Services.Protocols.SoapHttpClientProtocol (standard Microsoft .NET assembly) to talk to salesforce … 
the XML payload to the SOAP call was generated using a WSDL they generate from Selsforce … it is slow to get a matter and add a dataset (objects defined in our SalesForce application). 
I believe that these operations map to SELECT or INSERT of matter/dataset records in the app database

Please let me know any suggestions on how to find out the root cause of this issue or any additional info I can provide to troubleshoot.

Thanks!