Persistent connections that are dropped when the service is restarted OR the idle timeout has passed. if this is a connection pool and it hasn't been used in a long time the server can drop the connection but the pool will still thinkbits open and pass it out. Thus the server has gone away message.
To my knowledge, the service was not re-started (That's usually logged in the Windows Event Log, and there is nothing there). If it were idle time issues, I could understand one or two, but when this happens, I usually get 20 or 30 errors at one time. This is a web app, and users are either connected at the time, or attempting to connect.
Jesse
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