Charging my sansa clip+....

Hi, 

I’m trying to charge my mp3. I plug it into my laptop as usual. It comes up with “Connected” changes screen to “Writing” with the battery icon completely full… 

I unplug the mp3 and the battery is completely empty and it shuts off due to 'Low Battery" 
I have reset it for 30+ seconds and done all that I can think of to try and sort this but to no avail… 

Can anyone offer any advice of what I can do??? 

Thank you

Sounds like there may be some hardware issue with the charging circuitry. Is the unit still within warranty?