Smartbar loosing address

I have a smartbar that has several times lost it's address information. Once I go up and address it, it is fine for quite some time then it will eventually loose it. The smartbar directly beside it has no issue, just the one. At first I thought it was coupled to power loss. It always seemed to happen after when there was a potental loss and when noone was in the building.

Recently it has done it so I am told either right before an event with no real cause.

What could be causing one to loose address and not the other?

What should I do to fix this issue (troublesome to keep addressing it)?