backup exec stuck every few weeks

I got a backupexec 2012 installed on server 2008 which is DC&GC.
Tge abive is backing up 5 serversv 2 DC's + 1 Exchange 2010 + 2 other servers to network share. All is working fine jobs are finished successfully but every couple of weeks jobs are stuck in queded cant cancel them.
I need to restart backupexec services a few times thats the only thing that helps.

Need your techinical help.

P.s we wont to upgrade to backupexec 15 and move it to a new 2012 server witout lossing database and configration any guide on how to achive that ?

Im a newbie with this software.