Clip Sport disconnects while transfering files

Did you ever get a solution to this?  I’ve had a new Sansa Clip Sport delivered today and have the same problem.  I can’t load anything onto it from my PC.    I own 2 earlier models, the Clip +, and they work fine with this same PC.   This new one is meant as a present for a friend.  How disappointing that the new one doesn’t work.   I cannot get any help from Sansa.