I did eventually see this problem magically go away (whether that was a firmware update on Elks part, or something odd to do with re-connecting the M1EXP and providing it with ethernet i'm not sure). I have yet to try measuring the resistance across the bus as suggested by mikefamig.
Looking at the log, i do see the following related to about the time comms was last lost:
Event: 1141 = Expansion Module Trouble
Extended Data: Keypad 1
No other devices powered off the VAUX (i was planning on eventually doing this, but for the moment i'm using the provided power adapter).
I'll take a look at the connections, but if this was the case i would assume that connection loss would be apparent upon system power up.
I've recently added the M1XEP to my M1 setup and since then every night without fail my Keypad will start beeping in the early hours complaining about "Lost comms". If i power cycle the M1 terminal using the switch, the keypad happily reconnects. I've performed a few bus re-enrollments since but...
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