When I play YouTube on my TV through my beam and sonos amp, my ceiling speakers the music goes out of sync.

To be clear the ceiling speakers are hard wired into the Amp and the amp is linked to the Beam (and Sony TV)

I've played around with the app to no avail.  The Amp appears to run the sound slightly ahead of the Beam, and it sounds terrible!

What can I do to fix this ?

Thanks

Ollie