I'm sorry to hear you have an issue with your Slingbox staying on line. What I would like to know is this... What does your network light on the front of the Slingbox look like when it disconnects from the Internet? When you do the hard reset are you holding the reset button down for 35 seconds? Also, is there anything else that is connected to your network that is randomly disconnecting as well? Please see the links below for further troubleshooting steps that may help resolve your issue.
I hope this helps!
Sling media Moderation Team