Backup failing with error 41 (SQL)

[Helmynbu]

When attempting to take backup SQL from server as full backup it finishes successfully,

and after that  when attampting to take backup diffrential backup from the same server it failes with error 41 "network connection timed out".

and the data base is stripped in to 4 stripes.

[Marianne]

You need to give us more info.... 

Are you using SQL Intelligent Policies or script-based policies?
Can you show us the text in the Details tab of the job?

Have you tried to have a look at logs?
bpbrm on the media server
bpcd and dbclient on the SQL client