Flash cease to work after some time. Intrepid amd 64

Description: Ubuntu 8.10
Release: 8.10

apt-cache policy flashplugin-nonfree
flashplugin-nonfree:
  Installed: 10.0.15.3ubuntu1~intrepid1
  Candidate: 10.0.15.3ubuntu1~intrepid1
  Version table:
 *** 10.0.15.3ubuntu1~intrepid1 0
        500 http://se.archive.ubuntu.com intrepid-updates/multiverse Packages
        500 http://security.ubuntu.com intrepid-security/multiverse Packages
        100 /var/lib/dpkg/status
     10.0.12.36ubuntu1 0
        500 http://se.archive.ubuntu.com intrepid/multiverse Packages
     10.0.12.10ubuntu1~ppa3 0
        500 http://ppa.launchpad.net intrepid/main Packages

Flash works as expected for some minutes but cease to work.
Left is a grey box where the film was.
output of:
~$ ls -al /usr/lib/mozilla/plugins/
total 8
drwxr-xr-x 2 root root 4096 2009-02-15 19:26 .
drwxr-xr-x 4 root root 4096 2008-10-29 22:15 ..
lrwxrwxrwx 1 root root 37 2008-12-20 17:25 flashplugin-alternative.so -> /etc/alternatives/mozilla-flashplugin
lrwxrwxrwx 1 root root 44 2008-11-15 09:36 libtotem-basic-plugin.so -> ../../totem/default/libtotem-basic-plugin.so
lrwxrwxrwx 1 root root 42 2008-11-15 09:36 libtotem-gmp-plugin.so -> ../../totem/default/libtotem-gmp-plugin.so
lrwxrwxrwx 1 root root 44 2008-11-15 09:36 libtotem-mully-plugin.so -> ../../totem/default/libtotem-mully-plugin.so
lrwxrwxrwx 1 root root 50 2008-11-15 09:36 libtotem-narrowspace-plugin.so -> ../../totem/default/libtotem-narrowspace-plugin.so
lrwxrwxrwx 1 root root 26 2009-01-14 08:59 nppdf.so -> /var/lib/acroread/nppdf.so
lrwxrwxrwx 1 root root 57 2008-11-23 09:56 npwrapper.libflashplayer.so -> /var/lib/flashplugin-nonfree//npwrapper.libflashplayer.so
lrwxrwxrwx 1 root root 37 2008-11-21 18:15 npwrapper.nppdf.so -> /var/lib/acroread//npwrapper.nppdf.so

output of:
~$ ls -al /usr/lib/firefox-addons/plugins
total 8
drwxr-xr-x 2 root root 4096 2009-02-15 18:03 .
drwxr-xr-x 5 root root 4096 2008-10-29 22:13 ..
lrwxrwxrwx 1 root root 43 2009-02-15 18:03 libnpjp2.so -> /opt/java/jre1.6.0_12/lib/amd64/libnpjp2.so