Initiator Address Changes Itself

I'm noticing a troubling issue on the PS4000 SAN.

My original setup was two volumes:

Volume1 connected to 10.0.12.204 and 10.0.12.214

Volume2 connected to 10.0.12.224 and 10.0.12.234

And this had been working fine for months.

A couple days ago users started to complain about performance.  I started to look into this.

I noticed both volumes are now connected to 10.0.12.224 and 10.0.12.234.  204 and 214 don't have any sessions.

On Volume1 I can log off from 224 and re-connect to 204, but within a few seconds it drops 204 and goes back to 224.  I can't get it to stick back to the way it was originally set up, distributed across the four adapters.

Anyone see something like this before, and can offer some suggestions?  I'm thinking next time I can schedule downtime (Sunday overnight) I'll restart the controller...  Anything else?

TIA!