When I first began using my Panasonic SC-BT230, I was getting audio between my Directtv box and the unit using an optical cable. Now, just a couple weeks later, I have lost that connection and also don't get any sound when connecting an optical cable between the Panasonic unit and my tv. So, the only connection working is the analog aux input. I called Panasonic and their set responses to the question were useless. I have tried three different cables and none of them work. I can see the red beam at the end of the cables that go into the Panasonic unit. Any ideas?