Do you live in the tropics? Take your Sansa in the shower? (And if it’s a Clip, what are you doing on the Fuze board…but I digress…)
I have had an E200 for 3 years and a Fuze for more than a year with no charging problem. Both have open sockets, and I do not live in a dry climate by any means.
It would take a whole lot of work to get them to corrode beyond usability in two weeks.
You’re not plugging it into an iPod charger by any chance, are you? Because they are not compatible and pretty much guaranteed to fry if you do that. The plugs are different inside.
If the refurb “broke” in two weeks, I’m sure you can send it back. Funny that it’s exactly the same problem, though. I really suggest you take a close look at your charger. iPod chargers are for iPods.
