>I tried again and still fails, clicking, just rings and stops again alone, in a matter of half a second.
Poop! Just tested your app on galaxy S3; no issues with audio player. It sounds like your running into a known issue on some android devices where a phantom click/touch event is being sent immediately after play starts. This results in the play pausing.
If you click play after it pauses what happens?
See this post that sounds like similar issue: http://www.genuitec.com/support-genuitec/viewtopic.php?f=8&t=5974
Does this sound familiar?