Scandisk Sansa powers off when tapped on top

Hi, I have a Scandisk Sansa that powers off.  I noticed that it does it when I lightly tap on the top of the case.  It will also power off after about a min. or so with normal use.  I bought this at Walmart about 6 months ago.  This is the first problem.  Any ideas?  thanks   Dan P.

Yep, something is loose that shouldn’t be.  Call SanDisk for a warranty replacement.