Sound Event lag on MBP

Hi All,
I have just recently purchased a MBP and have noticed a delay in the sound events and even when playing a audio file.  I first noticed this when I emptied the trash and the sound came a good 2 seconds later.
Also when using MSN in the background the sound alert that a new message has been received intermittantly goes silent.
I have reset the PRAM, no effect.
Specs:
MBP 13" i5
OSX: Lion (fully updated with all firmware)
Purchse date: Oct 2011
How can I fix this problem?
Thanks!

I may have the same problem.
If there has been no sound in the previous 30 secs, there's a 2 second delay the next time there's a sound, e.g. if I start a video the audio only kicks in after the first 2 seconds.  It applies to all applications and system sounds.  If I stop a video and start it quickly thereafter there's no problem, but if I wait 30 secs or so there's a delay.
It's almost as though the audio is turned "off" after not being used for 30 secs, and when it is turned "on" it takes a couple of seconds to warm up.
My specs are the same as the original post.

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