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Cisco 1841 WAN and LAN port flapping

hi all,

i have a strange issue with one of our 1841 router. both WAN and LAN ports seems to be flapping but only to see "up" logs. please see below and help advise on this matter. thanks in advance!

#sh ver

Cisco IOS Software, 1841 Software (C1841-IPBASE-M), Version 12.4(15)T7, RELEASE SOFTWARE (fc3)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2008 by Cisco Systems, Inc.

Compiled Wed 13-Aug-08 15:34 by prod_rel_team

ROM: System Bootstrap, Version 12.4(13r)T, RELEASE SOFTWARE (fc1)

ROUTER uptime is 5 days, 4 hours, 46 minutes

System returned to ROM by power-on

System restarted at 09:34:27 SGT Wed Nov 30 2011

System image file is "flash:c1841-ipbase-mz.124-15.T7.bin"

Cisco 1841 (revision 7.0) with 115712K/15360K bytes of memory.

Processor board ID FHK131221XN

2 FastEthernet interfaces

DRAM configuration is 64 bits wide with parity disabled.

191K bytes of NVRAM.

31488K bytes of ATA CompactFlash (Read/Write)

Configuration register is 0x2102

#sh log | i Dec

Dec  2 15:36:13.247 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  2 15:48:22.535 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  2 17:06:18.049 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  2 17:25:39.854 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  2 17:52:48.192 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  2 17:54:29.664 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  2 18:06:27.448 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  2 19:34:49.849 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up

Dec  2 22:19:56.564 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  4 20:06:39.086 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up

Dec  5 05:05:07.374 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 08:53:08.406 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up

Dec  5 08:53:19.989 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up

Dec  5 09:41:16.568 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 09:42:14.195 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 09:42:14.351 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up

Dec  5 09:47:07.491 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up

Dec  5 10:09:40.560 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 10:09:49.012 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 10:09:49.328 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up

Dec  5 10:16:15.837 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 10:20:35.168 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 10:20:44.320 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 10:21:55.930 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 10:30:13.307 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 10:35:51.764 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 11:00:30.936 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 11:00:33.512 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 11:00:39.199 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 11:00:43.519 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 11:33:02.555 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 11:34:53.626 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 12:10:44.587 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 12:10:50.498 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 12:21:29.183 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 12:27:02.544 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 13:05:50.392 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 13:05:50.436 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up

Dec  5 13:36:38.954 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 13:36:48.149 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 13:37:15.307 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 13:37:17.575 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 13:40:29.252 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 13:42:57.509 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

Dec  5 13:47:32.935 SGT: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

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