12c: CRS processes restart periodically on cluster nodes

From MOS note ID 2074515.1 we find the article "CRS Processes Periodically Restart In Some Cluster Nodes in 12.1.0.2" which may be very important to keep an eye out for this showing up in your alert/trace files because it is caused by several slow ASM I/Os in a row!

Clusterware OC4J resource marked as OFFLINE

It seems like everybody knows that the localhost address is 127.0.0.1 if you are in IT, but what happens when Oracle does not remember that fact?  Well, you get what we had here in MOS article "ORA.OC4J Resource in Clusterware keeps going OFFLINE" via note ID 2025042.1 where you have to change configuration to hardcode the localhost address because it was not being resolved correctly and failing what looks like a heartbeat check.