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All 4 nodes intermittently unreachable

Daemon version: 2.0.5
Build time: 2023-11-28 14:01:07-00:00
Build version: 2023.08
Buildroot release: Buildroot 2023.08
API version: 1.1
BMC UI: v1.0.3

4 x CM4

At seemingly random intervels all 4 nodes become unreachable and the case fans stop spinning. All staus lights on the CM modules are off.

The BMC itself is fine and stays powered. both the Web UI and the API report that the nodes are powered

# curl --insecure "https://0.0.0.0:443/api/bmc?opt=get&type=power"
{"response":[{"result":[{"node1":"1","node2":"1","node3":"1","node4":"1"}]}]}

There is nothing noteworthy in dmeg that I can spot, or in /var/log/messages

How do I diagnose / troubleshoot htis issue?