I was watching LOTR R2 in DTS-ES and the sound went all was silent. After lots of playing around I found the following: It only happens in DTS-ES, DD5.1EX is fine I'm using a SONY STR-VA555ES, after turning off the surround back channel then back on again it worked again. I've tried different DVD players, cables etc to no avail. I'm just wondering if it's the DTS-ES flag on the DVD causing problems with my amp or just a faulty Sony amp? Sometimes the sound field indicator lights flicker as if they don't know what the sound is??? weird! has anyone else had sound probs??