I found this bug report when I was searching for a fix for a similar issue.
In my case all you have to do is move a window and then immediately click in
another window.
There may be other ways to reproduce this.
Investigating the issue I found this patch:
http://cgit.freedesktop.org/xorg/xserver/patch/?id=1884db430a5680e37e94726dff46686e2218d525
Subject: Revert "dix: use the event mask of the grab for TryClientEvents."
I am using xorg-server-1.8.0 and found the issue was introduced in
xorg-server-1.6.3. The patch fix appears in xorg-server-1.8.2 and later.
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Mouse events fail frequently and unpredictably, requiring kwin restart
https://bugs.launchpad.net/bugs/505494
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which is subscribed to xserver-xorg-input-evdev in ubuntu.
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