any reason why ActiveHome.RecvAction stops after several hours?

[wyx2000]

I put the following code into a windows service, but it only accepts data for a few hours. Kinds like the object is not available after that, after I restart the service, it will work again, any idea?
            ActiveHome = new ActiveHome();
            ActiveHome.RecvAction += new _DIActiveHomeEvents_RecvActionEventHandler(OnActiveHomeRecv);