ATV2 sound loss from HDMI, Optical or both!

Hi, Sometimes (and this is the rustrating bit), but not always the sound from my ATV2 will die. I have it connected to the TV via HDMI and also to a surround sound system via an optical cable.
I've played around with the audio setting in the ATV menu (16 bit, Auto, Dolby on/off/auto) etc and the same still happens. I have some movies I've watched a couple of times and the first time around they can play with DD 5:1 sound and the next time will be stereo only.
I've tried various different cables and all end up with the same results, is this and ATV problem? It just gets very annoying when you get to 15 minutes from the end of a film and the surround sound dies, then fingers crossed it *might* work through the TV sound to finish the movie off.
Thanks in advance.

No one??

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Sound disappeared from HDMI. MSI message in dmesg.

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00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 05)
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**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC270 Analog [ALC270 Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
pulse
PulseAudio Sound Server
sysdefault:CARD=Intel
HDA Intel, ALC270 Analog
Default Audio Device
front:CARD=Intel,DEV=0
HDA Intel, ALC270 Analog
Front speakers
surround40:CARD=Intel,DEV=0
HDA Intel, ALC270 Analog
4.0 Surround output to Front and Rear speakers
surround41:CARD=Intel,DEV=0
HDA Intel, ALC270 Analog
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=Intel,DEV=0
HDA Intel, ALC270 Analog
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=Intel,DEV=0
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5.1 Surround output to Front, Center, Rear and Subwoofer speakers
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snd_hda_codec_realtek 61193 1
snd_hda_intel 26180 2
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snd_hwdep 6300 1 snd_hda_codec
snd_pcm 75167 4 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel
snd_page_alloc 7217 2 snd_pcm,snd_hda_intel
snd_timer 18934 2 snd_pcm
snd 59989 9 snd_hda_codec_realtek,snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_hda_codec,snd_hda_intel
soundcore 5442 1 snd
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aplay -L
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Reboot the laptop.
Turn on the TV and select it's HDMI input.
Connect the HDMI cable from the TV to the laptop.
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Open the Mediasmart player.
Select DVD
Open "Settings" (the gear symbol)
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Select "HDMI passthrough" and apply.
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ATV2 sound loss from HDMI, Optical or both!

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