Do the desktop Slingplayer and the web-based player fail in the same way? What Stream Type (TCP, SNATT, or Relay) do you get when viewing your Slingbox? Approximate streaming speed? What Stream Type do you get viewing your friend's (working) Slingbox? Approximate streaming speed?
To view Stream Type (and other statistics info) in the web player, hold the Ctrl key and left-click in the palying video. In the desktop player, hold Shift and Alt then type I (which means Info).
If your friend's is TCP and yours not, you need to set up port forwarding on the router at the Slingbox location. Vice-versa, you could remove the port forwarding, or block the TCP connection, e.g. with Windows Firewall.
Have you confirmed that viewing your Slingbox from another country is still working properly?
Thank you for posting in the Slingbox Answers Forum! I'm sorry to hear you are having trouble keeping a connection to your Slingbox when connecting from Africa.
How exactly is the Slingbox connected to your router? Is it hardwired with an Ethernet cable, or are you using some sort of a wireless bridge?
Below is a link to an article that may help with troubleshooting this issue:
Hope this helps!
The Sling Moderation Team