e398 with 128m memory

Hi all
I recently got an e398with 64mb sd memory card. I wanted to store more songs
so I bought a 128mb sd card. The card works and I can load many more mp3s
but the phones playlist function doesn't seem to work. After one or two
songs the music just stops, mid song and I need to restart the player which
then proceeds to so the same thing again. I don't know if it's the presence
of just the extra memory, the extra files or something else. I suspect the
playlist manager software isn't compatable with > 64Mb of music files.

Has anyone had any experience of this? Anyone fitted 128Mb and not
experienced this?

S/W version: R372_G_0E.20.96R_A - if this helps.

Thanks
Dave