55" lcd rear projection. When speakers are connected to the audio out (headphone jack) sound is only present for approx 20 or 30 minutes. I'm trying to use a seperate pair of stereo computer speakers from this connection. Any thoughts on this would be helpful. I've tried a wireless speaker on this connection as well with the same result. It is easier for an elderley family member to control the sound that they can hear at their seat without the whole room being uncomfortable.