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Port mirror destination missing

I've come across a strange occurrence that I'm having trouble explaining.   I manage a Netvanta 1238p switch for a client that needs a single port to be mirrored to a single destination.  Twice now, the destination interface has dropped out of the monitor configuration.  Each time I look, the switch has not been rebooted and I show no records of someone logging into the device and making changes. The switch is running on AOS R13.5.1.  I'm wondering if anyone else has come across this or knows what could be causing the destination interface to be removed from the monitor. 

This is how I have the mirror configured:

monitor session 1 destination interface switchport 0/42

monitor session 1 source interface switchport 0/45 both

This is what I see when my client reports that the mirror is not working:

SWITCH-1#sh monitor session all

Monitor Session 1

-----------------

Source Ports:

    RX Only:   None

    TX Only:   None

    Both:      swx 0/45

Destination Port: None <<<<<<<<<<<<<<<<<<<<<<<<<<<< THIS

Thanks in advance for any help or advise.

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