A couple of months ago I had the issue that in an 18.104.22.168 environment with Grid Infra structure and ASM on Linux , without any specific reason at a specific point and time would see messages about communication error between the databases and the ASM instance and I was not able to connect to the ASM instance with a sqlplus / as sysasm. I have opened a tar back then and even got myself a fresh bug 14767353 number but no answers. So But practically this remained unsolved. Friday 4th I had same issue again, so it was time to get back to arms and investigate this.
Below you will find the steps , what i saw and how I solved it with the help of my friends(Google and Metalink).
Environment: 4 Node GI 22.214.171.124.0 on Red Hat Linux with ASM. Installations performed as oracle:dba