I found out why this is happening. In IIS7 on the Application Pool, there are ping settings that will kill a session if it gets not response. This is great for production as it keeps iis running slim but when debugging in Visual Studio and stopping on a breakpoint that is nasty.
I found an article that explains how to disable the ping or extend the timeout period.
Application Pool Ping setting in IIS
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Thursday, April 09, 2009
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