my modem keeps on freezing

, reboot it and router and i'm back in business. any ideas anyone please?
2007-04-28 12:44:23errorBPI FLASH: The Mfg CA certificate not found!2007-04-28 12:38:50informationIgnore SW upgrade via provisioning: same image!2007-04-28 12:38:48noticeInterface index:4 LinkUp2007-04-28 12:38:48noticeInterface index:3 LinkUp2007-04-28 12:38:48noticeInterface index:2 LinkUp2007-04-28 12:38:48noticeSNMP COLD_START(SNMP Nmaccess mode)2007-04-28 12:38:48noticeCable Modem Status set to Registration Complete2007-04-28 12:38:48informationReceived REG-RSP from CMTS2007-04-28 12:38:47informationSending Registration Request2007-04-28 12:38:47informationProcessing Configuration File2007-04-28 11:04:23informationDHCP: IP complete2007-04-28 11:04:23warningDHCP WARNING - Non-critical field invalid in response2007-04-28 11:04:22warningDHCP WARNING - Non-critical field invalid in response2007-04-28 11:04:22debugDHCP_coldstart() successfully2007-