Getting failure :- nsrndmp_save: Timeout reading

Hi All

Please any one can help me to resolve the below issue which is getting every day only some file system is failing with below error :-

client /root_vdm_1/cg_fs01/CS/C54 4 1268614302 3306 savegrp: suppressed 15 lines of output.
42738:nsrndmp_save: Data server halted: The backup is aborted by operator.
42593:nsrndmp_save: Unexpected reply message 0x400 is received. It may be
42594:nsrndmp_save: caused by the previous timeout.
42593:nsrndmp_save: Unexpected reply message 0x400 is received. It may be
42594:nsrndmp_save: caused by the previous timeout.
42887:nsrndmp_save: Error running backup.
42913:nsrndmp_save: Save session closed with NW server successfully

Details are below :-

backup server = 7.5 legato Unix Server

client = Nas Box

plz ask if u need more information

Thanks in Advance