I bought a new Panasonic DP UB9000. Worked fine for several days with HDMI lead to TV. I then connected an optical lead from TV to my DAC then to amps and speakers. This worked for a bit but now mostly gives a horrible distorted noise instead of audio from disc, not even close to being music or speech etc., just sheer noise but mid/high pitched not mains hum. But sometimes it works! What the hell could be causing this? I already posted an issue with this system several months back with no known cause where I couldn't place a component to the right of my preamp/power amps but could on the left! This is doing my nut in. How is it possible to have such a problem when noone else seems to have had it?? Is it the blu ray that's defective? Is it the optical lead? Is it the placement of the bluray player? Is it the disc? Is it a power problem? Is it my TV? All components are less than 2 years old except my amps.