Exchange 2013 VSS writers missing

i'm in the middle of migration from  Ex2007 to ex2013.
Migrated test account and created couple of migration jobs.
Everything seems ok but on Ex2013 Exchange VSS writers keeps vanishing.
I'm using BackupExec and will not finish migration until i sort the backup, i have found out that after restarting Exchange Replication service i'm having writers back for a while but then i came back another morning with another failed job because exchange writer went missing.

anyone had the same experience?

Windows Server 2012 R2
Exchange 2013 CU20
oompaloompaAsked:
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Sunil ChauhanLead AdministratorCommented:
have seen this issue multiple time, restarting the information restore service fixed the issue for me, if you have DAG setup then move the active DB on a different Node and then restart the service.
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oompaloompaAuthor Commented:
not for me, i have already tried restarting whole server, exchange writer came back for a while....
not a DAG, simple one server configuration
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Sunil ChauhanLead AdministratorCommented:
probably then check for the old vss shadows and try cleaning them.

VSSadmin list shadows
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oompaloompaAuthor Commented:
no old vss shadows...
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