Same issue here. We've got three macbooks (that sounds very fanboi I know, but two of them are from work, ok?) that we share adapters for and we've gone through three in the past year. OEM or knockoff, our house is an adapter graveyard. The macbook that we own has a nearly dead battery, it only lasts a few minutes off the charger. Could that be the cause of the problem? Personally I blame the kids - it's got to be something to do with them playing Minecraft all day. I'm wondering if I shoudn't just get a really beefy 16V supply and use one of the dead magsafe cables. That wouldn't be a bad thing would it?