Hi logicgate,
Have you tried the Howto
HERE
I followed it through twice just to make sure then formatted my player as FAT32 (Has to be FAT32 as FAT only supports up to 2gb)
Reformatting may help with stability!
I haven't gone above 12 folders yet as I haven't had the time to test it (damn work, really inconsiderate!!) But I will test more folders as soon a I get the time, as I suspect the reformatting may have helped.
Hope this might help!
Dave