Problem with Power Adapter. Please Help!

So, I recently noticed that when I try to use my laptop while it's charging up from a low battery it will randomly STOP charging. The annoying phenomenon usually occurs when I play video or surf online as the computer recharges from a low percentage (5%-50%). Now, I should be able to use my computer while it's charging, right?? Also, I discovered that the power adapter gets hot and makes a humming sound that grows louder right before it shuts off. The odd thing is, is that the laptop will charge just fine if I leave it alone. Weird!
I wouldn't be all worked up about this, but here is what has happened so far:
I have taken the laptop and power adapter to Apple several times and explained that the orange LED light shuts off and that I have to plug the adapter back into the wall to get it to come back on.
So far, the people at Apple have:
1) replaced the first power adapter (that did not work, so I went back)
2) gave me another power adapter (that also did not fix the problem)
3) actually replaced the battery (also did not solve this problem)
I don't know what to do because I don't want to look petty over a stupid problem. However, I have the warranty and this problem is becoming VERY annoying.
Any ideas or similar situations?
Thanks,
Aaron

Hi. Have you tried resetting the SMC: http://support.apple.com/kb/ht3964
And calibrating the battery: http://docs.info.apple.com/article.html?path=Mac/10.6/en/9036.html
Bob

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    PIN: C0001B7B4   Display/Scan Bar Code
    Knowledge Base Updates
    PIN: C0005A9AA   Display/Scan Bar Code

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