intel driver makes system hang

[lirel]

Binary package hint: linux-image

sometimes the system hangs. here it hung while updating the flashplugin.
those crashes seem to occour randomly never before the first 10minutes after powering up, never under 1hour after powering up.
it doesn't seem to depent on the load or usage of the computer.

it looks like the system enters S3 powerstate but keeps unresponsive:
- at first i can see an tty with some messages left from booting up.
- then there is this animation which occours while shutting down, but in false colors.
- later i see an flashing underline which seems to be repeated hundreds of time, so that it fills the upper hals of the screen.

the light from numlock scan still be switched on/off.
the crash can not be recovered from tty because crtl+alt+f1 doesn't work.
when pressing hte powerbutton the system shuts down entirely:
- the ubuntu shutdown animation in false colors, and then the computer powering off.

the graphics card is:
00:00.0 Host bridge: Intel Corporation 82845G/GL[Brookdale-G]/GE/PE DRAM Controller/Host-Hub Interface (rev 01)
00:02.0 VGA compatible controller: Intel Corporation 82845G/GL[Brookdale-G]/GE Chipset Integrated Graphics Device (rev 01)
aka
00:00.0 0600: 8086:2560 (rev 01)
00:02.0 0300: 8086:2562 (rev 01)

ProblemType: Package
DistroRelease: Ubuntu 10.04
Package: flashplugin-installer 10.1.53.64ubuntu0.10.04.1
ProcVersionSignature: Ubuntu 2.6.32-22.36-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic i686
AptOrdering:
 flashplugin-installer: Install
 flashplugin-nonfree: Install
 flashplugin-installer: Configure
 flashplugin-nonfree: Configure
Architecture: i386
Date: Mon Jun 14 14:07:11 2010
ErrorMessage: Unterprozess installiertes post-installation-Skript gab den Fehlerwert 1 zurück
SourcePackage: flashplugin-nonfree
Title: package flashplugin-installer 10.1.53.64ubuntu0.10.04.1 failed to install/upgrade: Unterprozess installiertes post-installation-Skript gab den Fehlerwert 1 zurück