Delayed Zone Transfers?

[Jiann-Ming Su]

What would cause a delay in zone transfers?  The notify go out immediately when the serial number changes on the master, but some of the secondaries can take up to 10 minutes before initiating the zone transfer.  Also, even after the zone has been transferred, the secondary will not immediately serve out the new data.  I'm running 9.8.1-P1, soon to be 9.8.3-P2.  Thanks for any insights.