Random drop in battery charge while using plugged-in computer

Hey everyone,
I bought my Macbook Pro a couple weeks ago and have generally used it while it is plugged in. Recently I've noticed that while I am using it, the battery charge will suddenly drop from 100% to around 50-60% and the MagSafe adapter will change from green to amber and begin charging the battery until it reaches 100% again. I calibrated the battery the day that I got it and I have never had a problem like this until now. CoconutBattery even says that my battery capacity is more than 100% of what it should be. Please let me know if this is something I should worry about!

I just noticed it happening again.
very strange.
AC Adapter connected and green
icon in menu bar shows AC is connected, not charging.
system profiler shows -1900 to -2500 mA
system profiler shows Fully Charged: No
system profiler shows Charging: No
I am starting to suspect it's related to the ipad being connected, as that takes a good chunk of power to charge.
I wonder if what's happening is that that with everything powered up on the macbook (External display, external Firewire hard drive, USB keyboard, Screen lit up, iPad connected) if it's somehow exceeding the capacity of the magsafe 85W power supply.
to test this out,
I've disconnected the ipad, firewire hard drive, and second display,
done a SMB and PRAM reset
and am charging the battery now.
after that I'll do a calibrate and try to avoid connecting things for the next few days to see what happens.

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