We recommend you to provide further information (be as specific as possible) about the issues you are getting. This way, other forum users will be able to help you with accurate information. Is the TV connected to the output of the Slingbox or to the Set-Top box?
If the TV is connected to the Slingbox, I recommend to try different audio cables and also Reset the Slingbox to factory settings to determine if the issue persists.
Let us know how that works