I get frustrated when I can't watch my Slingbox as well because of a router issue. I have found that if I do a hard reset on the Slingbox and then go back in and do the configuration all over again, it usually fixes the issue. For the initial setup of the Slingbox, I would make sure that it is connected directly to the router, that way there is no chance of an interruption of the internet signal.
Hope this helps.
Sling Media Moderation Team
Thanks for your response. I have done a couple of hard resets as well as reloading the Slingplayer app. Switching from the lincsys to the Apple Express did enable me to watch it for a long time finally, but then the next day I got the message indicating I had to reboot the Apple Express. That is fine if you are at home, but the objective is to watch away from home and I can't trust this system.