Juniper Netscreen Firewall: ARP failing

I have a Juniper Networks Netscreen firewall connected to an ADSL bonding device (xrio UBM 400).  The firewall has a static IP address (as does the bonder) but the firewall keeps disappearing and becomes completely unaccessible - PING fails and so on.  This happens unpredictably but regularly when the Internet connection is being used.

The bonder manufacturer says that the bonder sends out an ARP request to the firewall immediately prior to it disappearing and that no response is returned.  They are replacing the firewall with a Cisco unit but I'm interested/concerned to know what the problem here might be - why would the firewall do this?  It seems to remain accessible perfectly well by the static IP address when the internet connection isn't being used.
evbukAsked:
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rsivanandanCommented:
Are you running 6.1 or 6.0 ? If so, this is a known issue with the OS train. Ideally you should go back to the latest available on 5.4 and everything would be set alright. These boxes are amazing boxes. It is a problem and replacing it wouldn't be a good solution, what do you say :-)

Cheers,
Rajesh
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evbukAuthor Commented:
I've now made the switch to a Cisco PIX ASA 500 firewall and this displays exactly the same behaviour - the firewall just stops replying to PING requests after an unpredictable amount of time and the Internet connection fails.  The bonder remains responsive to PING when this happens but anything the other side of the firewall is unavailable.

The bonder device keeps sending ARP requests to the firewall which are not answered.

I am at a complete loss here.
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rsivanandanCommented:
Have they enabled logging on these boxes to see what happens during that time?

Cheers,
Rajesh
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