This might be caused by one of two things. Either you have a transaction commit somewhere in the code that is called prior to the EndRequest event being fired or the BeginRequest is not being fired (this can be caused by many things).
In order to fix the latter you have to not depend on the begin request for initializing your scope. You can either initialize in the pages or implement a custom HttpModule. We have a knowledge base article that describes how to do that. You can find it here. Please note that both the knowledge base article and code library are implemented using the new domain model approach. I will attach the code library implemented with the scope here. Note that you might have to update the references in the project in order to compile it.
I hope this helps. Please contact us back if you face further trouble.
All the best,
the Telerik team
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