MBP: no system sounds from internal speakers, other sounds fine

I have a 15" MacBook Pro (early 2011) running OSX Mountain Lion (10.8.2). Recently, I have noticed that it will occasionally stop making system sounds through my internal speakers following wake from sleep.
Playback from iTunes, Skype, internet etc seems to work fine, as does the volume increase/decrease feedback sound.
The problem persists until I reboot, then everything is fine again.
Not sure what's going on here, sometimes it will start playing all of the system sounds that had been saved up, i think it was when i pluged the headphones in. My Mac had been on for several days, and this playback took about 10-15 seconds of dings, beeps, trash empties etc to complete. From that point forward, things are normal.
It happens quite often and is getting really anoying.
Upon further testing I noticed that the system sounds stop (no crumple when emptying trash; no sent mail swoosh or iMessage pop).
I plug the headphones in and my machine makes all the sounds from the past several hours through the headphones. Again, things were fine from this point forward, whether I continued using the headphones, or unplugged and used the internal speakers.
Any ideas for things I can try to fix this?
Is this a hardware issue with the headphone jack?
If so, why would be stuffing up after a sleep/wake event ?

PRAM Reset
http://support.apple.com/kb/ht1379
Resetting the SMC
http://support.apple.com/kb/ht3964

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MBP: no system sounds from internal speakers, other sounds fine

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