I have a couple of systems that loose communcations with their expansion module. Thus the lines and extensions of the expansion module are dead.If you take the card out of the expansion module and then plug it back in, they come back up till the nest time. It seems to do this when we have had a power failure. Yes they are on surge and battery B/U. I have also checked to see that the back plane is connected and tight. If I just try and move the module around without removeing the card it won't come up. Has anyone else had this problem. Is it module problem or software?.