Problems with 24/192 files

My old router (a Belkin) played 24/192 files (such as Meet Me in London) played OK from UnitiServe into nDAC.  A little buffering if the NAS was doing anything else but on the whole fine when the system was dedicated to playing music.

I have recently changed ISP to BT Infinity which I'm mostly delighted with except the new BT Home hub appears to have affected the ability to play HD music files (24/192 or 24/96).  Now the sync light goes off,the HD light doesn't light - just the occasional flicker and second of music.  CD rips and other 16/44 files play absolutely fine.

Any ideas or similar problems with BT Home hubs?