Page 1 of Illogic Prolgic Shcnieder 855

I`ve posted a note before.
My Schnieder 855 sometimes doesn`t produce pro logic out-put on my prologic TV
I played Tomb Raider --Good Surround Sound
I played it again and the centre speaker and surround sound speakers didn`t work.
I asked asda and they are happy to give me a new one or a refund but don`t know whats wrong.
Is it something to do with the 855 lip syncing problem and, if so, will it happen on another machine or am I better to take the money and run?
Any suggestions for another multi region £100 machine