AT&T Cingular...

For like the third time now, my AT&T GoPhone (a Nokia 3590, they've changed the phones since I got one) switched from reading "AT&T Wireless" to "Cingular"... and now it's reading no network at all... and back to AT&T Wireless.  The twist is that I'm at home, and the cell tower is a short (2 min) drive away near a CVS drugstore.

Has anyone else experience that in your own area?  (I know of one area which it changed back and forth while traveling, which is basically where Rt 40 and Interstate 70 meet in Maryland.)