Unstable internet connection with a DSL2640U

Hello ,
Can anybody check the logs below and tell me why my DSL2640U (HW: C1; FW:RU_1.00) drops my internet connection every minute ???
KR,
Tarik.
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System Log

Date/Time Facility Severity Message
Jan 1 00:00:20 syslog emerg BCM96345 started: BusyBox v1.00 (2008.08.04-06:22+0000)
Jan 1 00:00:20 user notice kernel: klogd started: BusyBox v1.00 (2008.08.04-06:22+0000)
Jan 1 00:00:20 user warn kernel: Linux version 2.6.8.1 ([email protected]) (gcc version 3.4.2) #1 Mon Aug 4 02:16:38 EDT 2008
Jan 1 00:00:20 user warn kernel: Parallel flash device: name MX29LV320AB, id 0x22a8, size 4096KB
Jan 1 00:00:20 user warn kernel: 96338W2_E7T prom init

Jan 1 00:00:27 user crit kernel: ADSL G.992 started
Jan 1 00:00:32 user crit kernel: ADSL G.992 channel analysis
Jan 1 00:00:38 user crit kernel: ADSL G.992 message exchange
Jan 1 00:00:38 user crit kernel: ADSL link up, interleaved, us=284, ds=2272
Jan 1 00:00:38 user warn kernel: ATM Soft SAR: ATM link connected.
Jan 1 00:00:40 daemon notice pppd[325]: PPP: Start to connect ...
Jan 1 00:00:40 daemon crit pppd[325]: PPP server detected.
Jan 1 00:00:43 daemon notice pppd[325]: PPP: Start to connect ...
Jan 1 00:00:44 daemon crit pppd[325]: PPP server detected.
Jan 1 00:00:47 daemon notice pppd[325]: PPP: Start to connect ...
Jan 1 00:00:48 daemon crit pppd[325]: PPP server detected.
Jan 1 00:00:48 daemon crit pppd[325]: PPP session established.
Jan 1 00:00:48 daemon crit pppd[325]: PPP LCP UP.
Jan 1 00:00:49 daemon crit pppd[325]: PPP LCP UP.
Jan 1 00:00:51 daemon crit pppd[325]: Received valid IP address from server. Connection UP.
Jan 1 00:00:52 user notice dnsprobe[886]: dnsprobe started!
Jan 1 00:00:54 user notice syslog: siproxd.c:192 INFO:siproxd-0.5.10-2842 i686-redhat-linux-gnu starting up
Jan 1 00:00:54 user notice syslog: siproxd.c:218 INFO:daemonized, pid=934
Jan 1 00:00:54 user notice syslog: sock.c:65 INFO:bound to port 5060
Jan 1 00:00:54 user notice syslog: register.c:65 WARNING:registration file not found, starting with empty table
Jan 1 00:00:54 user notice syslog: siproxd.c:265 INFO:siproxd-0.5.10-2842 i686-redhat-linux-gnu started
Jan 1 00:00:56 daemon err user: No server certificate found. Skip checking on certificate.
Jul 20 11:05:45 daemon err user: tr69c: Unable to retrieve attributes in scratch PAD
Jul 20 11:05:45 daemon err user: Stored Parameter Attribute data is corrupt or missing
Jul 20 11:06:03 user crit kernel: OAM loopback response not received on PORT/VPI/VCI 0/8/35.
Jul 20 11:06:04 user crit kernel: OAM loopback response not received on PORT/VPI/VCI 0/8/35.
Jul 20 11:06:47 user alert kernel: Intrusion -> IN=ppp_0_8_35_1 OUT= MAC= SRC=41.250.109.178 DST=41.250.111.190 LEN=48 TOS=0x00 PREC=0x00 TTL=125 ID=15640 DF PROTO=TCP SPT=2533 DPT=445 WINDOW=65535 RES=0x00 SYN URGP=0
Jul 20 11:07:10 user alert kernel: Intrusion -> IN=ppp_0_8_35_1 OUT= MAC= SRC=41.250.120.169 DST=41.250.111.190 LEN=52 TOS=0x00 PREC=0x00 TTL=125 ID=2497 DF PROTO=TCP SPT=2064 DPT=445 WINDOW=65535 RES=0x00 SYN URGP=0
Jul 20 11:07:13 user alert kernel: Intrusion -> IN=ppp_0_8_35_1 OUT= MAC= SRC=41.250.120.169 DST=41.250.111.190 LEN=52 TOS=0x00 PREC=0x00 TTL=125 ID=2501 DF PROTO=TCP SPT=2064 DPT=445 WINDOW=65535 RES=0x00 SYN URGP=0
Jul 20 11:07:37 user alert kernel: Intrusion -> IN=ppp_0_8_35_1 OUT= MAC= SRC=41.248.158.64 DST=41.250.111.190 LEN=64 TOS=0x00 PREC=0x00 TTL=46 ID=15549 DF PROTO=TCP SPT=19662 DPT=135 WINDOW=53760 RES=0x00 SYN URGP=0
Jul 20 11:08:17 user alert kernel: Intrusion -> IN=ppp_0_8_35_1 OUT= MAC= SRC=41.250.105.243 DST=41.250.111.190 LEN=48 TOS=0x00 PREC=0x00 TTL=126 ID=28846 DF PROTO=TCP SPT=3560 DPT=445 WINDOW=65535 RES=0x00 SYN URGP=0
Jul 20 11:12:43 daemon crit pppd[325]: Clear IP addresses. Connection DOWN.