Backup Exec 2010 R3 Stuck in Queue

I have a sheduled backup job that start to run from 7pm which backup on two tapes,  when it riches around 1.7 TB ( in which when succeed reaches about 1.9 TB), it stuck. It dozen't give any error ( even in Windows Event Log). It just give the alert "Please insert overwrite-able media " . When i cancel the job and perform inventory it succeed. The most wired is that, when i see the job history while the job is queue, it shows me there are many jobs still running but when i see the job history after canceling the job , it show all completed ( except the verifications) and the only error it shows is that the job cancellation i performed.