Can adapter cause erratic charging behavior?

For months, my 15" aluminum G4 Powerbook, which otherwise works fine, started slowly losing its charge--went down to 92%, 80%, sometimes 70%, then started recharging, apparently by itself. Also, the light often showed orange at 100 or 99% and sometimes turned green when it was going down. However, the battery appears to work normally when used without the adapter.
I called Apple and was told to reset the PMU and zap the PRAM, which helped. I then bought a new Macbook, and as soon as Apple had transferred my data from the PB to the Macbook, the weird behavior suddenly disappeared.
In the last couple of days, though, it's started again--battery apparently draining for no reason, then recharging again. This time, I tried tightening the connections at various times (duckhead, extension cord head, PB plug), and doing that does seem to get the battery to start recharging. I also noticed that the base of the adapter where the cord winds around the feet, and the adapter itself in that area, seem unusually warm. But the adapter is supposed to get warm when plugged in, right?
Has anyone else had this problem, and if so, did replacing the adapter fix it? (And should I buy fire insurance for my apartment?) Thanks for any advice you may have.

Here is an article on troubleshooting power adaptors:
http://support.apple.com/kb/TS1725
The body of the power adaptor can get warm, but it should not get too hot. If you think it is getting hot enough to possibly start a fire, you should stop using it immediately. Don't take any chances with it.
Do you have access to an Apple Store? If so, you could try one of their known good adaptors and see if the weird behavior continues with it. If not, then a new power adaptor might be in order. If the weird behavior continues, then you have a different problem.
You could also get your own power adaptor evaluated.
Good luck!

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