Networked Unitor8mk2 & AMT8 losing communication a lot...

Hey Guys,
I have a Unitor8mk2 and an AMT8 networked together as one 16-port interface and they've always been rock solid - until recently. The computer seems to lose communication with the AMT8 (the slave of the two - the Unitor is the one that's directly connected to the Mac). I have to turn them both off and back on for the computer to see them both, and that's getting old.
It almost seems like a random software thing or a conflict somewhere - the hardware hasn't changed at all, and has been installed in my console for years.
Any thoughts? I've removed any other MIDI drivers to eliminate any potential conflicts.
Thanks so much...
Jim

More specifics:
My setup is
Mac Pro via USB to first unit (Unitor 8 MkII)
Unitor 8 Mk II via RS422 to 2nd unit (AMT8 #1)
AMT8 #1 via RS232 to AMT8 #2
AMT8 #2 via RS422 to AMT8 #3
Using Unitor 8 control (version 3.1), and both before and after having replaced EmagicUSBMIDIDriver.plugin with a fresh install taken via Pacifist from the Logic Studio DVD's (hassle-y little project in itself), it finds the unitor and the first AMT8. No matter hwat else is done, since two evenings ago, AMT8 #2 and AMT8 #3 are not found. Howver, hitting the panic button in Unitor 8 Control lights up the expected buttons on all four units. Also, hitting the Panic/Patch button on the Unitor as well as the first AMT8 (#1) lights up the expected LED's on all four units, while hitting the same buttons on AMT8 #2 and #3 lights up only its adjacent neighbor, but not the Unitor and the first AMT8.
Thus there is a possible electronic explanation: whatever carries signal from the latter units in the chain and past the #3/#2 "barrier" is faulty. Doesn't sound impossible, though it does sound unlikely. In other words, signal will flow from the mac and outward, and also outwardly from the two units closest to the mac, but not in the opposite direction. Obviously it still can be software, which doesn't make for pleasant pictures. And regardless of how pecuniary or anti-MIDI Apple seems to be, their having designed a killer patch, set to go off on a certain date, just to eliminate the last vestiges of the Emagic hardware legacy seems unlikely, since it would probably be discoverable.
On the cables not being able to be faulty, or more correctly the connectors, oxidation is a fact regardless of mechanical issues, so it isn't entirely impossible. I have some DeOxit and ProGold around, and might do some dabbing if less extreme approaches yield nothing more...

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