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Hi take a look at Issue #3 in the following note: Top 5 Grid Infrastructure Startup Issues [ID 1368382.1]
One of the possible causes is that a specific resource is not online. Presumably some of your resources are still up.
PS: Why are clients connecting directly via vip when you have SCAN configured?
As per my point of view
VIP is managed by Oracle Clusterware(vip,evm,crs,css..), CRS is one of component of Clusterware
Oracle Clusterware has 2 heartbeats 1)Network heartbeat 2)Disk heartbeat
If a node does not send a network heartbeat then node is evicted from cluster
If disk heartbeat (voting disk) is not updated in <I/Otimeout>, then node is evicted from cluster