First, Thanks for your response allan.
Like EarthKMTech said, it is intermittent and could take days or even two weeks to show it's ugly head. I have always been present after it happened, and a simple restart restores function. Frequently there have been partial lockups, in which copying or printing still functioned, but the opposite function would show the authentication failing. Additionally, sometimes the CE password for service mode and/or the admin password would fail. Usually a reboot restored function, but on three occasions one of these machines had to have a CE password reset with the assistance of the hotline. I don't know if any of this information is useful, but there it is. Personally I think these 454e and 554e machines are on the verge of a brain aneurysm and will just lock up permanently.
Does anybody remember the Mita DC-1656 when it first came out? Perhaps three times a week our new customers would call to say the copies had gone all black. When I checked service mode every single mode setting was at zero, including the lamp intensity. Several months down the line Mita discovered that there was some sort of grounding issue, in which a single static touch from an enduser would wipe the service mode. They send us little plastic bags of those stick on static grounding brushes to stick in 4 or 5 places on the machine. To my great surprise it actually worked. I expect it to be something like that. =^..^=
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