Problems with my power adapter!!!!

I just got a new adapter for my Powerbook G4 the other day because the wiring at the plug on my old one wore out. My problem is that the new adapter, when plugged into my computer, sometimes just stops working like it has been unplugged or something. After unplugging the adapter from the wall socket and reinserting, it works fine until my computer goes to sleep. At some point in sleep mode, the little light from the plug in the computer turns off and my computer is only running on battery. This in itself is not that bad, but it gets to be a hassle having to unplug and then re-plug the wall plug everytime my computer goes to sleep. Can anyone help me understand this a little better?

I purchased by G4 six months ago. Since Day one, I have had problems with the power. If I leave the computer plugged into the outlet 24 hours a day, the battery will slowly begin to drain. Even if I never unplug the power source from my computer, the computer begins to drain battery life. For example, I went to bed with my computer charged @ 100%. This morning (all while my computer was sleeping), I have 8% Battery Life left.
I've spent 5-6 phone calls with Apple Care on this issue with no resolution. I sent my G4 off to Apple Care 2 weeks ago and they returned it with a "We Don't Recognize a Problem". I about went through the roof. And, yes, this happens with any outlet I use.
I expect more from a $2500+ machine and their "award winning" customer service.
Help?

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