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Backup jobs tend to take very long then fail?

Created: 20 Apr 2010

i have a problem at the moment on Symantec 12.0 REV 1364
To give you an instance i am running a job now, which is a daily incremental.
the server is 70 gigs in size, its taken 4 hours to run the job yet at 250 the total data had been captured, now the job sits and the status is running?
and eventually it will fail?

i find this extreemly frustrating because it then bombs the rest of my jobs from a time frame?
any help would be appreciated