CentOS & dropped FireWire drives -- please help.

I installed Oracle Clusterware 10.2.0.3 (as well as RDBMS 10.2.0.3) on 64-bit CentOS 4.5 running on 2 AMD64 machines. Installation went fine and everything started/worked. But occasionally the FireWire drive is disappearing (fdisk –l giving nothing) and CRS crashing! The problem doesn’t seem to be CRS – it got to be the combination of OS (Linux kernel 2.6.9-55.EL) & Oracle FireWire module (built into kernel using source code) – or may be the Card or Ethernet cable! I didn’t see anything in the /var/log/messages -- totally lost & can’t do anything!
Can you please tell what might be the reason & how to resolve it? Any help will be highly appreciated.
Thanks.

Hi, Thanks Very much for the reply.
I got into this situation by applying a permission change to the whole of the Macbook folder, i dont really know what you would call it but the one containing all the system, library and other system files. Here is the result i got
james-pipers-macbook:~ cablemaster$ ls -aldeO /etc/sudoers
-rw-------+ 1 root wheel - 1135 24 Sep 2007 /etc/sudoers
0: user:jamespiper allow read,write,append,readattr,writeattr,readextattr,writeextattr,readsecurity
1: group:admin allow read,write,append,readattr,writeattr,readextattr,writeextattr,readsecurity

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