Default Icon swapping in Start bar

Out of the blue (I haven't changed or installed anything) my battery indicator icon on the Start bar gets sporadically replaced with a little clock icon that is used to display upcoming appointments. I say sporadically, because I can't duplicate the problem at will. Sometimes it's one, sometimes the other. Soft reset didn't fix it. Very strange. Any ideas? I'm WM6.0 running the Kaiser today screen since '07. Thanks... Bob