System.InvalidOperationException an asynchronous module or handler completed while an asynchronous operation was still pending

I get the following error randomly on my production Couchbase server:

"System.InvalidOperationException
an asynchronous module or handler completed while an asynchronous operation was still pending"

I am using the latest Couchbase server and the latest version of the .Net SDK. When I run locally I do not see this error at all.

On production I have a two node Couchbase client. The config section is the following:

<couchbase>
<servers bucket="Staging" bucketPassword="">
<add uri="http://COUCH01.mobitorhost00.local:8091/pools" />
</servers>
</couchbase>
<enyim.com>
<memcached protocol="Binary">
<servers>
<add address="COUCH01.mobitorhost00.local" port="11211" />
</servers>
<socketPool minPoolSize="10" maxPoolSize="100" connectionTimeout="00:01:00" deadTimeout="00:01:00"/>
</memcached>
</enyim.com>

When I switch to the Memcache provider instead the error does not appear.

Thanks for your help. This is really a show-stopper for us.

Here is a stack trace:

Storex.Site.dll!Storex.Site.MvcApplication.Application_Error() Line 53 C#
[Native to Managed Transition]
System.Web.dll!System.Web.Util.ArglessEventHandlerProxy.Callback(object sender, System.EventArgs e) Unknown
System.Web.dll!System.Web.HttpApplication.RaiseOnError() Unknown
System.Web.dll!System.Web.HttpApplication.PipelineStepManager.ResumeSteps(System.Exception error) Unknown
System.Web.dll!System.Web.HttpApplication.BeginProcessRequestNotification(System.Web.HttpContext context, System.AsyncCallback cb) Unknown
System.Web.dll!System.Web.HttpRuntime.ProcessRequestNotificationPrivate(System.Web.Hosting.IIS7WorkerRequest wr, System.Web.HttpContext context) Unknown
System.Web.dll!System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(System.IntPtr rootedObjectsPointer, System.IntPtr nativeRequestContext, System.IntPtr moduleData, int flags) Unknown
System.Web.dll!System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(System.IntPtr rootedObjectsPointer, System.IntPtr nativeRequestContext, System.IntPtr moduleData, int flags) Unknown
[Native to Managed Transition]
[Managed to Native Transition]
System.Web.dll!System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(System.IntPtr rootedObjectsPointer, System.IntPtr nativeRequestContext, System.IntPtr moduleData, int flags) Unknown
System.Web.dll!System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(System.IntPtr rootedObjectsPointer, System.IntPtr nativeRequestContext, System.IntPtr moduleData, int flags) Unknown
[AppDomain Transition]

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