Fuze crashes trying to play mp3 after ogg

So,as promised, I have done some more testing. 

I have ripped a track to .wav from CD and then encoded, witout tagging, directly from the command line by calling:

oggenc <infile> <outfile>
lame -V2 <infile> <outfile>
lame -b 192 <infile> <outfile>

These commands should encode the files with fairly standard values as ogg, VBR mp3 (quality value 2) and CBR mp3 (192 kbits/s), respectively.

Encoder versions:

oggenc --version says:
oggenc from vorbis-tools 1.2.0

lame --version says:
LAME 32bits version 3.98.2 (http://www.mp3dev.org/)

I have also made two playlists, where the ogg file is once played before the VBR mp3 file, and once before the CBR file.

Audio files were placed in the MUSIC directory, playlists in player root. All files were
transferred in MSC mode using cp.

For me, the playlist with the VBR mp3 file works fine, the other one leads to the freeze when finished playing the ogg file. This, so far, has been reproducible and has been tested several times with different files.

My Fuze was freshly formatted (using its internal “System Settings -> Format”
menu item) before copying anything.

It seems to me that the problem is caused by playing CBR mp3 after ogg.

So now I am a bit at a loss, for I am no expert in audio formats. What further tests could I conduct? Should I contact SanDisk supprt and send them the files to test? 

Regards,

soenke