Yea that what I felt. This wxm and mp40 been running a year without issues then all of a sudden it started to go missing.^This is something to consider.
Neptune has recommended the use of ferrite cores around cables (nearest plugs/ports) for the symptom of [things disappearing].
I had a super repeatable case that happened with support on the line (two technicians in fact) and that is what they asked me to try first. After weeks of going back and forth (testing/recommendations/testing/etc) this recommendation solved the issue of modules and (specific) sensors going offline or missing altogether off and on.
Granted, my issue wasn't with CORs or with WXMs, but it might be something to try. Also, *nothing* in my setup had changed or moved so it was weird that I experienced such intermittent issues after a period of things working fine. The nature of interference is that it isn't always persistent or problematic.