I have the same thing happen. Mine doesn't stop on it's own, but they don't start up when the server is restarted. It's a problem with the 3 services in the default web site. I haven't tried F5 to refresh, I've found that viewing the properties on each of them and showing it where to find the folder that it points to (ex: MBX, Backofficestorage, etc.) fixes the problem. I have the same question....WHY DOES IT HAPPEN IN THE FIRST PLACE? It must be a misconfiguration on my server, but I just don't know what it is....