X restarts after switching from vt7 to console

[Ralf Baerwaldt <f999540@ffzj0yey.dresdner-bank.com>]

Hi !
When switching from X-Window to Console (Ctrl-Alt-F2)
X-Server makes an automatic restart after a short time
(5 to 20 seconds)and the kdm login screen appears again
on vt7.

How can I avoid it ?

I suppose its a KDE- or KDM-Problem, because it
does not happen via fvwm2.

Installation:
Debian-Knoppix 3.2 (10.Apr 2003)
XFree86 4.2.1
KDE 3.1