[Gnux]

I've got a weird problem, here is my /var/log/messages exerpt:

Sep 16 22:27:29 darkstar modem_run[618]: ADSL line is up (160 kbit/s down | 96 kbit/s up)
Sep 16 22:27:39 darkstar pppd[621]: pppd 2.4.1 started by root, uid 0
Sep 16 22:27:39 darkstar pppd[621]: Using interface ppp0
Sep 16 22:27:39 darkstar pppd[621]: Connect: ppp0 <--> /dev/pts/1
Sep 16 22:27:39 darkstar pppoa3[622]: pppoa3 version 1.2-beta2 started by root (uid 0)
Sep 16 22:27:39 darkstar pppoa3[622]: Control thread ready
Sep 16 22:27:39 darkstar pppoa3[632]: host  --> pppoa3 --> modem stream ready
Sep 16 22:27:39 darkstar pppoa3[633]: modem --> pppoa3 --> host  stream ready
Sep 16 22:27:39 darkstar /etc/hotplug/net.agent: assuming ppp0 is already up
Sep 16 22:27:44 darkstar pppd[621]: local  IP address 193.253.60.237
Sep 16 22:27:44 darkstar pppd[621]: remote IP address 193.253.160.3
Sep 16 22:27:44 darkstar pppd[621]: primary   DNS address 193.252.19.3
Sep 16 22:27:44 darkstar pppd[621]: secondary DNS address 193.252.19.4
Sep 16 22:28:48 darkstar pppoa3[622]: Received signal 15 (thread 16384)
Sep 16 22:28:48 darkstar pppoa3[622]: Woken by a sem_post event -> Exiting
Sep 16 22:28:48 darkstar pppoa3[622]: Read from usb Canceled
Sep 16 22:28:48 darkstar pppoa3[622]: Write to usb Canceled
Sep 16 22:28:48 darkstar pppoa3[622]: Exiting
Sep 16 22:28:48 darkstar pppd[621]: Modem hangup
Sep 16 22:28:48 darkstar pppd[621]: Connection terminated.
Sep 16 22:28:48 darkstar pppd[621]: Connect time 1.2 minutes.

Does anyone see where the problem could be and how to solve it?
Thx