multiple "Task ended on server PureDisk:"

Hi

I'm getting multiple error messages in the Problems / Disk Log in Netbackup 7.5.0.5 administration console:

"Error    0    33280    Task  ended on server PureDisk:SERVERNAME on host SERVERNAME.                nbemm"

Jobid=0 Type=33280 Process=nbemm

There's usually multiple (50+) entries in a row with "Task ended on server". All backupjobs are running fine, the disk pool (MSDP) have status "Up", but what does the errors mean? The only related documentation I can find is this, and it doesn't really explain anything:

http://www.symantec.com/business/support/index?pag...

The server is running on Win2008R2, NB version 7.5.0.5, using MSDP.