cluster issues after adding node

hi all,

i've been scratching my head around a strange issue with a cluster.

I originally have two nodes:

node1
node2


these two nodes are not in the same subnet


in a cluster and both are working fine. Last night I added a new cluster member: node3 and since I have done this i've observed really strange behaviour.
node 1 and node3 are in the same subnet.

the behaviour I see is:

when node1, node2 and node3 are on, i lose connectivity to node3 and graphs dont' update
when node1 and...

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