Volume + "shuts off" Sansa Express #2

The volume + button “shuts off” our Sansa Express 1G.

This is list of the contents of our Sansa Express 1G:

Folders:  Music   Playlist   Record

Specific files:

  RAMLIST.DAT

  RECINF0.LOG

  STDBDATA.DAT

  STDBDATA.IDX

  STDBSTR.DAT

  STDBSTR.IDX

  VERSION.SDK

All folders & files are dated 12/27/2002 1844.

File VERSION.SDK content is 01.01.12A, which is reflected in the “Settings | System Info” menu item.

Are any of these files inconsistent with firmware version 01.01.12A?