JFFS2 CRC err

Dear Mr, Matthew,

I have been working on Atmel's AT91RM9200DK board, which is
using serial dataflash AT45DB62. I have created a JFFS2 partition on the device to store my filesystem. I have been able to mount the partition succesfully but when i do my read/write operations sometimes i get CRC errors. Here are the steps that i am following

1) Using kernel linux-2.4.26 patched with 2.4.26-vrs1
2) Partitioned the dataflash into 3 parts i,e 2 MB, 3MB and 3MB by specifying it in the driver code in at91_dataflash.c
3) booted the system and the erased the partitions . Last partition is my filesystem partition, so i erased it using -j option which makes it jffs2. Now i mounted the last partition as "mount -t jffs2 /dev/mtdblock/2 /tmp/" and it mounts succefully and then i copy out my required files in this directory. And if i run my application now it runs successfully without any problem. Even if i kill my application and launch it again it run successfully . But if i do an unmount once and try the same procedure of mounting again and running the application it shows me an error

Data CRC 0xABCD != calculated CRC 0xWXYZ

Please let me know where i am going wrong ? and what was
the kernel and patch used by you ?

Narinder