WCF Throttling Issues with .NET 3.0 SP1
When you install SP1 for .NET 3.0 by default that changes the throttling settings you might be use to. You could get into a situation where a number of calls are processed and then they stop with the client eventually timing out. To get around this you either explicitly close your connection (which is a good practice in most cases) or change the serviceThrottling setting in your WCF config.