Weird Network Discovery Reset Problem!

>I am using Vista Business, with a wireless connection to a private network.
> I have enabled network discovery in the Network and Sharing Center, and
> set
> the network type to private.
>
> Here is the problem:
>
> I can see & contact other computers on the private network with no
> problem -
> except that periodically, for some unknown reason, Network Discovery seems
> to turn itself back off. After that, when I try to connect to another
> system
> on my private network, I get a message that "Network discovery and file
> shareing are turned off. Network computers and devices are not visible.
> Click to change". So I click to turn network discovery back on, then I am
> able to use the network again with no problem - until the next time I need
> it when it again seems to have turned itself off and I repeat the process.
> This is very annoying.
>
> Does anyone know why Network discovery & File sharing turns itself off
> periodically, and how to stop it from doing that so that
>
> discovery and sharing remain on inside a private network?
>
> Thanks,
> Ray
>
>
>