I understand that you are having some issues with the Slingbox AV since the signal freezes up and is very choppy.
Most of the times, this issue could be related to a slow connection speed on any of the ends. With this in mind, I recommend you to check how the Slingbox works at home.
First, I recommend you to reset the Slingbox, set it up for Internet Viewing and test how it works on both ends. While testing it, make sure to check the connection speed. The following links will provide you with instructions and further information that might be helpful for you: