journal rollforward failed: journal out of sync with zone

[Bryton]

Hi,

I have observer a SERVFAIL error in one of my zone.On checking the logs 
I realized there is this error

/journal rollforward failed: journal out of sync with zone/

I tried to learn more about it and I found out the solution is to delete 
the journal file and restart bind.I tried that and it works.Now I wonder 
what is the reason for such error and what the permanent solution to 
mitigate it.

Regards,
Bryton.
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