Small update on this, it seems that running start all may fix this, I have had 3 nodes running without issues now but not starting them individually. May be worth trying for others with the same trouble on multiple nodes.
Just want to add that another coin holder pointed out a problem and I have confirmed it, running several nodes from a single cold wallet seems to cause strange problems with nodes dying or reporting odd error messages. You can see failed nodes by running "./BitCurrencyProd masternode status" on your VPS. A key sign is a weird 00000 VIN. The following has been tried without success so far
1) Running Genkey for each node again
2) Moving the coins to another address in the same wallet to get a new "output"
3) Forcing connection to the node with "addnode VPSIP onetry"
Looking into it as best as possible but wondering if anybody else has any feedback running more than 2 nodes from a single cold wallet?