Volume's Owning Controller automatically changes.

Hi,
Our Setup is as follows.
- 1 SunfireV440 and 2 SunfireV490(Running on Veritas Cluster)
- 2 StorageTek 6140 (1GB Controller, Total 4 HostChannels)
- 2 Brocade SAN switches.
All the 4 host channels of both the 6140 is connected to the SAN switch as a redundancy configuration.
The Volumes are Identical on Both the Storages. Mirroring is done across the storage via Veritas. Multipathing is also done through Veritas.
Volumes are mapped using Licensed Storage Domains.
Issue:
Out of the 38 Volumes, we face issues on 4 particular volumes. The issue is these Volumes's Owining Controller has got changed automatically and the CAM is showing the Boxes as Degraded and generates Alarm.
All the 4 volume's preffered controller is A and owning controller is B.
There is no harware errors, Controllers, Cables, Switch and HBA are working fine. Except the 4 volumes rest of the volumes are all Owned by their Preffered Controllers.
All the even LUNs are give to Ctrl. B and odd LUNs to Ctrl. A
We tried re-distributing the volumes which resolved the issue, but the Owning Controller got changed again after 2 days.
What might be causing the volume to move from its preffered controller as there was no physical errors.
Is this some kind of loadbalancing on the controllers?
Thanks for any help.
Regards,
Hari.

If you're using MPxIO (aka STMS) you should check /var/adm/messages which should contain any failover messages - if both servers say that the cause of the failover is external, you need to check the switches and all the paths in between the hosts and storage (all the fibres / SFPs / patch panels etc)
--A.

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