Corsair VS1GSDS400/EU 1GB in Duo

Ok,
Found this in the system.log:
""
[Mar 31 21:39:58 nas-02-63-74 mountd[952]: authenticated mount request from 192.168.1.34:1023 for /c/nfs (/c/nfs)
(User comment: sombody logs in)
Mar 31 21:40:16 nas-02-63-74 kernel: phy_irq 8008 repeated 1
Mar 31 21:40:47 nas-02-63-74 kernel: rxS1(00ca0000),rxS0(008000be)
Mar 31 21:42:26 nas-02-63-74 kernel: + phy_irq 8008 repeated 2
Mar 31 21:42:26 nas-02-63-74 kernel: unlinked
Mar 31 21:42:26 nas-02-63-74 avahi-daemon[879]: Withdrawing address record for 192.168.1.41 on eth0.
(User comment: system stops using its IP-address)
Mar 31 21:42:26 nas-02-63-74 avahi-daemon[879]: Leaving mDNS multicast group on interface eth0.IPv4 with address 192.168.1.41.
Mar 31 21:42:26 nas-02-63-74 avahi-daemon[879]: iface.c: interface_mdns_mcast_join() called but no local address available.
Mar 31 21:42:26 nas-02-63-74 avahi-daemon[879]: Interface eth0.IPv4 no longer relevant for mDNS.
Mar 31 21:42:31 nas-02-63-74 kernel: linked, 1000mbps mode
Mar 31 21:42:31 nas-02-63-74 avahi-daemon[879]: New relevant interface eth0.IPv4 for mDNS.
Mar 31 21:42:31 nas-02-63-74 avahi-daemon[879]: Joining mDNS multicast group on interface eth0.IPv4 with address 192.168.1.41.
(User comment: tries to use its IP-address again)
Mar 31 21:42:31 nas-02-63-74 avahi-daemon[879]: Registering new address record for 192.168.1.41 on eth0.
Mar 31 21:42:38 nas-02-63-74 upnpd(eth0)[1267]: received signal 15, exiting
Mar 31 21:42:40 nas-02-63-74 exportfs[2247]: /etc/exports [1]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/media". Assuming default behaviour ('no_subtree_check'). NOTE: this default has changed since nfs-utils version 1.0.x
Mar 31 21:42:40 nas-02-63-74 exportfs[2247]: /etc/exports [2]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/nfs". Assuming default behaviour ('no_subtree_check'). NOTE: this default has changed since nfs-utils version 1.0.x
Mar 31 21:42:40 nas-02-63-74 upnpd(eth0)[2254]: Listening on 192.168.1.41:50000
Mar 31 21:42:40 nas-02-63-74 upnpd(eth0)[2254]: setsockopt - IP_ADD_MEMBERSHIP: Address already in use
Mar 31 21:42:40 nas-02-63-74 upnpd(eth0)[2254]: Failed to add membership for address 192.168.1.41
(User comment: IP-address not granted)
Mar 31 21:43:02 nas-02-63-74 nss_wins[2264]: can't find host time-e.netgear.com
Mar 31 21:43:23 nas-02-63-74 nss_wins[2264]: can't find host time-h.netgear.com
Mar 31 21:43:23 nas-02-63-74 nss_wins[2264]: no servers can be used, exiting
Mar 31 21:45:53 nas-02-63-74 kernel: phy_irq 8008 repeated 21
Mar 31 21:45:53 nas-02-63-74 kernel: unlinked
Mar 31 21:45:53 nas-02-63-74 avahi-daemon[879]: Withdrawing address record for 192.168.1.41 on eth0.
(User comment: try once more)
Mar 31 21:45:53 nas-02-63-74 avahi-daemon[879]: Leaving mDNS multicast group on interface eth0.IPv4 with address 192.168.1.41.
Mar 31 21:45:53 nas-02-63-74 avahi-daemon[879]: iface.c: interface_mdns_mcast_join() called but no local address available.
Mar 31 21:45:53 nas-02-63-74 avahi-daemon[879]: Interface eth0.IPv4 no longer relevant for mDNS.
Mar 31 21:46:04 nas-02-63-74 kernel: enable_irq(11) unbalanced from 80036a24
(User comment: Waht does this mean?)
Mar 31 21:46:09 nas-02-63-74 kernel: hotplug powersave returned 0x100enable_irq(11) unbalanced from 80036a24
Mar 31 21:46:26 nas-02-63-74 kernel: hotplug powersave returned 0x100linked, 1000mbps mode
Mar 31 21:46:26 nas-02-63-74 avahi-daemon[879]: New relevant interface eth0.IPv4 for mDNS.
Mar 31 21:46:26 nas-02-63-74 avahi-daemon[879]: Joining mDNS multicast group on interface eth0.IPv4 with address 192.168.1.41.
Mar 31 21:46:26 nas-02-63-74 avahi-daemon[879]: Registering new address record for 192.168.1.41 on eth0.
Mar 31 21:46:35 nas-02-63-74 upnpd(eth0)[2254]: received signal 15, exiting
Mar 31 21:46:36 nas-02-63-74 exportfs[2473]: /etc/exports [1]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/media". Assuming default behaviour ('no_subtree_check'). NOTE: this default has changed since nfs-utils version 1.0.x
Mar 31 21:46:36 nas-02-63-74 exportfs[2473]: /etc/exports [2]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/nfs". Assuming default behaviour ('no_subtree_check'). NOTE: this default has changed since nfs-utils version 1.0.x
Mar 31 21:46:36 nas-02-63-74 upnpd(eth0)[2480]: Listening on 192.168.1.41:50000
Mar 31 21:46:36 nas-02-63-74 upnpd(eth0)[2480]: setsockopt - IP_ADD_MEMBERSHIP: Address already in use
Mar 31 21:46:36 nas-02-63-74 upnpd(eth0)[2480]: Failed to add membership for address 192.168.1.41
Mar 31 21:46:39 nas-02-63-74 kernel: padre_power_down_task
(User comment: I press the shutdown button)
Mar 31 21:46:39 nas-02-63-74 init: Switching to runlevel: 0
Mar 31 21:46:54 nas-02-63-74 kernel: hotplug powerdown returned 0x100<4>nfsd: last server has exited
Mar 31 21:46:54 nas-02-63-74 kernel: nfsd: unexporting all filesystems
Mar 31 21:46:54 nas-02-63-74 kernel: RPC: failed to contact portmap (errno -5).
Mar 31 21:46:55 nas-02-63-74 exiting on signal 15
(User comment: I press the start button)
Mar 31 21:48:17 nas-02-63-74 syslogd 1.4.1#10: restart.
""

This
""
Mar 31 21:42:26 nas-02-63-74 kernel: + phy_irq 8008 repeated 2
Mar 31 21:42:26 nas-02-63-74 kernel: unlinked
Mar 31 21:42:26 nas-02-63-74 avahi-daemon[879]: Withdrawing address record for 192.168.1.41 on eth0.
""
looks like the start of the problem.

Is it memory related? I just changed from 256MB to 1GB.
If not, what has happened?

Regards,
Armand