Sorry to hear that you're having trouble with your Pro-HD. I would advise to first try clearing the cache from the Slingplayer for Desktop application. The first link below will walk you through how to do so. If that does not resolve your issue, I will include some additional links related to this problem. Hope this helps!
- Slingbox.com - Why has Slingplayer stopped responding?
- Slingbox.com - The Network light on your Slingbox blinks or turns off
Sling Media Moderation Team