3.9 Stops working

[infomas]

I just upgraded to 3.9. Subsonic was working fine up until this upgrade. Now, after some long period of time the web server seems to stop working. I receive a page not available message in my browser. I go to the Subsonic control panel and it says that it is running. I stop and start it and all is fine again. I am running XP. Any ideas what might be going on?