might be a problem with the cable...
same thing happened to me before my cable stopped working all together.(it would work on and off... sometimes working other times not.)
then it got stolen.(

... stupid people... stealing a broken cable!

)
funny stuff.
so then i got a new cable from my friend who had had his player stolen.(and therefore he didn't need the cable any longer.)
my suggestion...
buy an new cable...
or...
find a friend of yours that has a sansa and borrow their cable.
and...
if the new cable doesnt work any better than your current one then just return it.
