Changing attributes

[Fred Johanson]

I've got a client that generates this 5-6 times a night:

03/09/10   03:29:03      ANR1639I Attributes changed for node NIROLO: TCP Name 
from
                          OLORIN to NIROLO, TCP Address from 128.135.19.3 to
                          128.135.19.5, GUID from 
fd.5f.d0.81.cd.7b.11.de.a8.c7.00-
                          .25.64.90.25.15 to 
9a.9c.1b.81.31.8b.11.dd.a6.6f.00.19.b-
                          9.46.ae.e1. (SESSION: 103251)

It goes back and forth, causing great confusion to TSM.

I've asked the owner what he's doing and he asks me the same.  Anyone with an 
explanation?