Ora Errors in Alert Log:ORA-27508, ORA-27507, ORA-27300, ORA-27301

I have a Solaris 5.9 machine with Oracle 9.2.0 installed on it.It is a RAC configurations with 3 DB instances. But the connectivity to the database is lost intermittently.
I am getting the below mentioned message in the Alert Log:

ORA-27508: IPC error sending a message
ORA-27507: IPC error disconnecting from a port
ORA-27300: OS system dependent operation: DIS: NCON: connect failed: cnh 0 failed with status: 134
ORA-27301: OS failure message: Transport endpoint is not connected
ORA-27302: failure occurred at: skgxpdis
ORA-27303: additional information: DIS: NCON: connect failed: cnh 0x1039208e8, rqh 0x10391bfb8

After searching a lot on various forums, I could not get any resolution to the above errors.
Could someone please help me out with this issue.
Thanks a lot in advance.

whats the status of your cluster services