It sounds more like your battery is going, more than anything else. I had a third party battery die on me, and I could not get the adapter to go amber. In my experience the Yoyos are more durable than people give them credit for. I really have not had a problem with mine, although I did purchase a second one because I did not like the chord discoloration I noticed. I still have it and it probably still works.
Long live the clamshell iBooks!