Mac mini mid 2010, lion os x. Samsung TV, optical out to external speakers. Mac connected via hdmi cable - output sound 'samsung tv' For some reason the sound cuts out intermittently,music, films etc. If i connect a normal phono lead out the mac mini headphones jack direct to the speakers the sound is fine. Why does hdmi cut out? Even if i diss the external Tv speakers & just use the internal TV speakers it cuts out... If i use bluetooth headset with mac the sound is fine. Deffo some issue outputting sound via hdmi i think? Any ideas?