My end-user got message Virtual machine vSphere Replication RPO is violated by 1 minute(s), they claimed this message cause the server hang.
is there any experiences or other-thought about it?
Not an experience, more of a thought.
If your replication is a bit too slow because of some component between your main and recovery site, the VM might be quiesced to meet the RPO.
You may want to increase your RPO to allow for the delay in replication or disable quiescing (cheap workaround).