He decidido hacerle un reset y parece que se ha solucionado, pero me ha creado un montón de archivos pequeños de unos 4 o 5 megas numerados que he tenido que borrar y al final de todo un archivo log, que al leerlo me he asustado un poco, creía que se había roto el disco duro.
Esto es un poco de lo que dice el archivo :
FAT filesystem check detected problems that were fixed:
/TMP/ADDIT/SYNCCO~3 starts with free cluster
repair action: truncating
FAT filesystem check detected problems that were fixed:
/TMP/ADDIT/SYNCCO~1 starts with free cluster
repair action: truncating
FAT filesystem check detected problems that were fixed:
has entries after end of directory
repair action: extending directory
Lost cluster chain at cluster 4
1 Cluster(s) lost
repair action: converting lost chain to file
Lost cluster chain at cluster 5
1 Cluster(s) lost
repair action: converting lost chain to file
Lost cluster chain at cluster 6
1 Cluster(s)