Is there a bug with Control Panel : Select a power plan

I have a Lenove R61 running Windows Vista. The default Plan (power plan) for
my machine is something called "Energy Star", which initially is set so that
the "Advanced" power setting for Wireless Adapter Settings has "Maximum Power
Saving" for both "On battery" and "Plugged in".

Naturally the performance of my computer sucked when it was set to "Maximum
Power Saving", even though the computer is about one meter from the wireless
transmitter.

Thanks for that by the way.

So I set the thing to "Maximum Performance" for "Plugged in". Except that
every once in a while, apparently all on its own, the setting gets changed
back by something in the Operating System. I don't notice for a while, until
I start to think that the damned DSL is down again. Then I open my control
panel and realize that, indeed, the setting for my power plan has changed
without my having done anything.

Please fix this. I have already had two other people newly introduced to
Vista who have complained about their wireless or VoIP being much worse than
Windows XP, and I tell them about the power saving options, and they make the
change and things improve. But then it changes back all on its own. Not good.
Really quite bad, actually. Makes me think about buying a Mac next time.