howto fix this message ?

[HS8JCV]

Hi all
After I mount jffs2 partition and I read write partition.
I got this message.

Internal flash device timeout occurred or write operation was performed while fl
ash was programming.
Internal flash device timeout occurred or write operation was performed while fl
ash was programming.
.......

I use nor flash SST39VF3201.
How to fix this message.?

Thank you and Regard
Mr.X