twice it has happened already that when I tap on the screen after standby (not suspend, just that screen-off state) the backlight switches on, everything looks normally, time counts on, mouse cursor moves etc. but no keyboard or mouse input is possible anymore.
Tje only way out of that situation seems to be a reset (reset switch).

This has happened with pdaXrom 1.1.0beta3 with Matchbox.

Is this a WM problem or an X server problem?
So, if I switch to IceWM, may this solve the problem?

It seems it happens if I leave the Z on over night, maybe with XMMS running and / or compiling something, and in the morning tap on the screen.
This is fatal, as I don't always close and save all files before I leave the Zaurus alone.

Thanks for any hint.