New 15" Macbook Pro with periodic charging issues

Hola a todos,
I've had my Macbook Pro (2011, 15", 2.2 GHz Intel Core i7, 8GB RAM, still running Snow Leopard, blahblahblah) for two months now, and it's been having charging problems on and off since its first day out of the box. Basically, when it happens, it will be plugged in and the battery display will cycle from "Not Charging" to "Calculating" to showing charging times like "30:00." It also cycles between green and amber lights when this is happening. Even when it's showing these supposed 20+ hour charging times, it doesn't charge at all. It also tends to run really hot when this is happening, even with minimal usage (i.e., the CPU sometimes gets as high as 90°C with leisurely web browsing when this happens, and the fan runs like the computer is trying to take off from a helipad).
Updates, SMC and PRAM resets, and the like don't help. And it's definitely a computer issue - when it does this, it continues to do it no matter what power adapter I plug it into or what wall outlet I'm using. However, calibrating the battery usually will keep it from doing this for a couple of charge cycles, which is why I briefly thought this wasn't an issue, but it keeps returning - and I can't run a full calibration cycle every time I need to use my computer, since sometimes I need to use my computer continuously without letting it die... and calibrating every 48 hours shouldn't be necessary with a new computer. Sometimes it stops on its own (without calibration) for a while and starts charging normally
What is going on? Is this the battery? The MagSafe board? Something else? Has anyone else experienced this? I'm sure I can get it fixed, especially since I have AppleCare, but I'm hoping I'm not going to have to leave my computer for someone for an extended period to have this fixed, since I can't function without it for school/work... blehhh.
Thanks so much if you have any wisdom to impart about this weirdness.

That's definitely the plan whenever I finally have time to do that, but in the meantime I'm just curious if anyone has had this problem or if anyone knows what might be wrong (and how much trouble and time it might take to get it fixed). It also doesn't seem to be getting worse, but I guess I need to know if it's the sign of something that could get worse so that I don't put the repairs off too long. I am usually pretty capable of diagnosing my own computer problems, if not fixing them, but this time I'm baffled.

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