I would check to see if your router is actually keeping the LAN IP address for your pro, or if it's dropping it from the network. Look in your DHCP configuration on your router. I had this problem until I hardcoded the IP address of the slingbox into the router. Here's the thread that talks about that, as well as the walkthrough on how to do it.
see my post about 2/3 of the way down the page.
http://www.slingcommunity.com/forum/thread/17954/slingbox-dissappearing-on-the-network../
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