Assistance recovering from "split brain" / corosync issues.

I've had a fairly stable cluster running for quite a while. I needed to add two additional nodes. After the add of the first additional node, I suspect the cluster entered a "split brain" situation, because it started hiccuping, and at this point the GUI is non-responsive on most nodes. Basically, upon entering the gui, all the machines appear to be offline with a small red X, although they are in fact online and VMs continue to work as expected.

I have verified that /etc/pve/corosync.conf...

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