Using Slingbox out of town. Been watching for several weeks. Last night changed channel and lost video. Changed again and lost audio also. Remote access to DVR it is connected to shows it is functioning (recorded scheduled shows today). Tried to power on DVR when connected to slingbox with no success. Get No Video Detected from both iPad and PC. Would appreciate any advice on how to fix. We are out of town til the end of the month and miss of DVR.