Microsoft-Windows-Application Server-System Services Event Collector, SqlException, Timeout expired

Question

We have an AppFabric server using SqlExpress for the Monitoring and the Persistence store. We have had this config in test and in beta for a while without any issues. Of course now, we're released', we are starting to see some issues. Everynow and the a WF gets suspended.

The error i'm seeing in the tracked events is:

System.ServiceModel.FaultException`1[System.ServiceModel.ExceptionDetail]: The operation could not be performed because the instance is in suspended state. (Fault Detail is equal to An ExceptionDetail, likely created by IncludeExceptionDetailInFaults=true, whose value is:
System.InvalidOperationException: The operation could not be performed because the instance is in suspended state.
   at System.Runtime.AsyncResult.End[TAsyncResult](IAsyncResult result)
   at System.ServiceModel.Activities.Dispatcher.ControlOperationInvoker.ControlOperationAsyncResult.End(Object[]& outputs, IAsyncResult result)
   at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeEnd(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage7(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)).

Which i have seen before and has always been a programmer error. But this time i'm running fully tested code so this is not possible. So I dive in the Event log. And at about the same moment is find this in the EventLog:

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
  <Provider Name="Microsoft-Windows-Application Server-System Services Event Collector" Guid="{A174E94E-A6F8-4041-9206-BF7B345729B0}" /> 
  <EventID>108</EventID> 
  <Version>0</Version> 
  <Level>2</Level> 
  <Task>0</Task> 
  <Opcode>0</Opcode> 
  <Keywords>0x8000000000000000</Keywords> 
  <TimeCreated SystemTime="2012-07-05T13:54:50.751554800Z" /> 
  <EventRecordID>47</EventRecordID> 
  <Correlation /> 
  <Execution ProcessID="1252" ThreadID="2984" /> 
  <Channel>Microsoft-Windows-Application Server-System Services/Admin</Channel> 
  <Computer>aocsrv25.vlm.be</Computer> 
  <Security UserID="S-1-5-19" /> 
  </System>
- <EventData>
  <Data Name="HostReference">JobMotor/, JobMotor/ConsoleHostService</Data> 
  <Data Name="ExceptionMessage">Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.</Data> 
  <Data Name="ExceptionData">System.Data.SqlClient.SqlException (0x80131904): Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() at System.Data.SqlClient.TdsParserStateObject.ReadSniError(TdsParserStateObject stateObj, UInt32 error) at System.Data.SqlClient.TdsParserStateObject.ReadSni(DbAsyncResult asyncResult, TdsParserStateObject stateObj) at System.Data.SqlClient.TdsParserStateObject.ReadNetworkPacket() at System.Data.SqlClient.TdsParserStateObject.ReadByte() at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) at System.Data.SqlClient.SqlInternalConnectionTds.CompleteLogin(Boolean enlistOK) at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, TimeoutTimer timeout) at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, TimeoutTimer timeout, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) at System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.SqlClient.SqlConnection.Open() at Microsoft.ApplicationServer.Monitoring.EventCollector.DatabaseWriter.WriteToServerUsingBulkCopyPlugin(IBulkCopy bulkCopyPlugin, WriteBuffer buffer) at Microsoft.ApplicationServer.Monitoring.EventCollector.DatabaseWriter.Write(Object parameter)</Data> 
  <Data Name="OccurrenceMap">5</Data> 
  <Data Name="Occurrences">1</Data> 
  <Data Name="InstanceName" /> 
  </EventData>
  </Event>

Strange thing is, if i start browsing through the event log, this has happened quite frequently on that machine. I can't find any explanation for this, so I'd love to hear your opinions...