I'm assuming you're strickly talking about using the Slingplayer Mobile for iPhone in testing the 3G or WiFi connectivity.
Most likely it has to do with something in the office. Maybe the router, firewall, or wifi access point as doing something wonky. Of course, we would need process of elimination to determine where problem might lie. Begin by eliminating doubt using the Web Slingplayer from Sling.com or the Slingplay Desktop 2.0 on a laptop or desktop computer. Make note if you're can duplicate the issue over wired or wireless. Another way, is to test WiFi access in another location like at a Starbucks, Panera Bread or Barnes & Nobles. That will take your office equipment out of the question and test your iPhone's WiFi radio.