Sorry for the delay in response. The first thing any of our agents would have you do to troubleshoot this particular issue would be to have you uninstall and reinstall the SlingPlayer application from your device. If you need assistance in doing this, check out the link below:
(Note: The article refers to the SlingPlayer for Android Phone rather than tablets, however the process is identical.)
Hope this helps!
Sling Media Forum Moderation Team