Problems with multiple sounds

I’m using the AS3 iOS mode in CS5. It seems like playing sound fx on the timeline is unreliable. I’ve set all my sound to stream, which I’ve been told works, if they’re all set to the same (not event). I get this when I export:

SWF contains multiple copies of a sound item

I’ve started to play internal sounds from the library, but this also seems to have problems if I want to repeat the same sound clip on different frames of a timeline.

Can anyone advise what to do about this? I don’t know if it’s a bug, or my own inexperience! Sometimes when I delete code with sound in, the error still stays!

I’d just like to know best practice. Thanks