IChat audio drops off

I've looked about, but can't seem to find anyone with a similar issue, my iChat audio drops off.
I spend long hours on video iChat and for no apparent reason, after a while, my fiancée will think I'm being quiet.
I can open the Audio/Video preferences and the sound meter bar will be unresponsive to all sounds.
I go into the computer sound settings and the input bar will be active, jumping up and down the meter with any sounds made.
The only way I seem to be able to regain the sound it to quit iChat and open it again and then recall my fiancée.
Does anyone know a cure that will stop this happening, it's been going on since updating to 10.7.3

Hi,
As there are no actual volume settings in iChat itself there is obviously some sort of Capping mechanism or some process that does not fire properly.
On the whole I tend to keep my computer volume Low and use this AppleScript to increase the Volume (output)
Some while ago I added the Input volume line:-
using terms from application "Messages"
on av chat started
        set status to away
        set status message to "In Conference . . ."
        delay 0.2
        set volume input volume 85
        delay 0.2
        set volume output volume 50
        delay 0.2
    end av chat started
end using terms from
this needs to be stored in your Home Library/Scripts/iChat (or Messages folder) and linked to in iChat > Preferences > Alerts by changing the top item to Video Chat Started and enabling the Applescript option and linking to the Script.
7:21 PM      Saturday; March 31, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Lion 10.7.3)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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