Use a Titanium G 4 867 with OSX 10.5.8 Leopard. After upgrading to Leopard operating system from Tiger I began having issues with my ITunes hanging up on me. I don't know if this was a coincidence that this started shortly after installing Leopard or not. This problem arises when I'm using Youtube as well. There will be times where the sound performs without a problem then suddenly starts having issues and begins to hang or cut in and out. Use headphones a lot and when this starts happening if I take the headphones out of jack it tends to activate the audio again. This may only be for a brief moment sometimes then it freezes/hangs up again. Someone with any ideas or similar problems in the past please let me know. Need to narrow the possibilities.