Power adaptor suddenly stops working

my power adaptor has a strong tendency to stop working for no reason - one minute the light on the connector is green or orange and my computer is happily running/charging, then suddenly (usually without my noticing it) the light goes off, the computer starts running on battery, then goes to sleep. it's simple enough to fix - i just unplug the adaptor then plug it back in and it starts working again. however, it's pretty frikkin annoying.
it's bad enough when i'm actually at my computer, cause i at least get a 10 second warning that my battery is low and the computer is about to go into sleep mode, so i can jump up, run over to the wall socket, unplug and replug my adaptor, and with luck the computer hasn't gone to sleep yet. however often i'll leave my laptop running for a long download, only to come back later and find it asleep, with a 2 hour download cut off 1 1/2 hours in. arrrgh!
the thing is, i've owned 5 different apple laptops, and probably 6 or 7 standard issue apple adaptors, over the many years, and i had this probelm with the last 5 or 6 of them. is this a feature? what can i do to stop this? i love apples but i must say i've never had this problem with any of the pc's at work. also i'm surprised to have the problem replicated with so many adaptors, yet not see any other threads on the subject. is it me? am i doing something wrong?
ibook g4 Mac OS X (10.4.3)

Over time, the settings in the Power Manager
may become unusable, which can result in operational
anomalies with the computer. Examples include not
turning on, not waking from sleep, not charging
the battery, or not seeing the AC Adapter, among
others."
G5 DP 2GHz,
23ACD, iBook, AEBS Mac OS X (10.3.7)
it's a new ibook (2 months old) so i wouldn't think this is the case - but as it sounds plausible i've tried it anyway. i'm going to leave the laptop on for a day or 2 and see if this solved the problem.
by the way, i do tend to leave my laptop on for days at a time if that makes any difference here...
ibook g4 Mac OS X (10.4.3)

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