mouse freezing w/ KDE

[Christoph Moebius <cmoebius_(_at_)_bsdhessen_(_dot_)_de>]

Hi there....

Mmmmh... did someone experience the following problem:
On a OBSD3.0-stable box the mouse works fine with xdm. When
you log in and KDE is up and running it still works.
After some time the mouse simply freezes - no error message - no hang.
Often the mouse can be brought back to life  by switching to the text console
(Ctrl-Alt-F1) and back to KDE.
This behaviour seems to happen more often if you close some sessions
of "aterm". 
Is there a fix for this? The KDE is the version that's on the 3.0 CD -
I only updated the kernel and the system binaries.

Thanks a lot,
Christoph Moebius

ps.: BTW - the mouse is a Micro$oft Intellimouse w/ PS/2 plug. In the
XF86Config-File it is configured as "wsmouse"