Windows service starts and stops automatically

[Eugene]

I have two window services that I created in C# and VB.net, one each, and set
them to manual startup type. However, sometimes (not everytime) when I starts
the service, an error message pops-up to say the service started and stopped
automatically.

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The dicer service on Local Computer started and then stopped. Some services
stop automatically if they have no work to do, for example, the Performance
Logs and Alerts service.
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Why is this so? What causes it? Anyhow I can solve this? I am running the
service on Windows XP.

thanks
Eugene