SMON one one node blocking SMON on other nodes

We have 4 node RAC architecture in our production environment.Recently we saw some some issue where it was seen that SMON on node4 blocked SMON on all the other 3 nodes.
At the same some of the applications reported performance issue and timing out issue.While investigating the wait events we saw a lot of latch free wait event with latch# 34.
Due to SMON blocking issue, we decided to bounce the node 4 and once the instance was brought back, we didn't find those specific latch free wait event. Even the application reporting performance issue started behaving well.
I would like to know if there is any relation between the two - SMON blocking and particular latch.Pls explain me.

1. Exact version?
2. Which wait event were 3 SMONs watining for?
3. Under your environment, what is the latch name for latch# 34?
select name from v$latch where latch# = 34;
It seems that SMON in node4 has acquired some latches or locks and not released it. The common reason is internal bug. I recommend searching metalink for latch name for wait event name.

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