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The TV is a Panasonic TX-L42E6B connected by a digital cable to DAC Magic Plus then to a 2 channel musical fidelity amp via standard audio leads. The TV is connected wirelessly to the Internet. To get any sound at all through this route when using Netflix or BBC Iplayer etc. I need to go into the TV's sound menu and select SPDIF>PCM (other option being Auto)
the audio is about three quarters of a second slow.
I agree that wifi is a likely issue... I had some issues with my TV and sound sync. Then stuck in a LAN cable and all has been well.... Not an IT expert, so all I can do is give the result. I haven't a clue as to the reason!!!