RT-N66U dropping connection to UBEE modem ?

[n2ubp]

I recently switched from DSL to cable for Internet service. DSL connection was solid but slow. The connection between the RT-N66U router and the TWC Ubee DDM3521 modem drops every 15 to 20 minutes with no errors posted at the modem. >>I seem to be loosing the DHCP lease even though the router reports prior to the failure that there is 15 to 20 hours left on the lease.<<Running Merlin 3.0.0.4.374.36_beta1-sdk5. I tried swapping out the ethernet cable between the modem and the router as well as adding ferrites to each end of this cable. Wondering if I should go back to the 276 firmware or perhaps this is a TWC problem? I'm new to cable modems. Does not seem to be much in anything the end user can adjust. Suggestions appreciated. - Steve 73 de N2UBP

log file from router before and after drop.
Not sure what I am looking for but I don't see anything exciting here.
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Feb 2 09:43:32 dnsmasq[16170]: using nameserver 209.18.47.62#53
Feb 2 09:43:32 dnsmasq[16170]: using nameserver 209.18.47.61#53
Feb 2 09:54:36 dnsmasq-dhcp[16170]: DHCPINFORM(br0) 192.168.1.20 3c:a9:f4:5a:a4:3c
Feb 2 09:54:36 dnsmasq-dhcp[16170]: DHCPACK(br0) 192.168.1.20 3c:a9:f4:5a:a4:3c Kris-T530
Feb 2 09:55:15 rc_service: httpd 300:notify_rc restart_firewall
Feb 2 09:55:15 start_nat_rules: apply the nat_rules(/tmp/nat_rules_eth0_eth0)!
Feb 2 09:55:15 dnsmasq[16170]: exiting on receipt of SIGTERM
Feb 2 09:55:15 dnsmasq[16599]: started, version 2.67 cachesize 1500
Feb 2 09:55:15 dnsmasq[16599]: compile time options: IPv6 GNU-getopt no-RTC no-DBus no-i18n no-IDN DHCP DHCPv6 no-Lua TFTP no-conntrack no-ipset no-auth
Feb 2 09:55:15 dnsmasq[16599]: warning: interface ppp1* does not currently exist
Feb 2 09:55:15 dnsmasq[16599]: asynchronous logging enabled, queue limit is 5 messages
Feb 2 09:55:15 dnsmasq-dhcp[16599]: DHCP, IP range 192.168.1.2 -- 192.168.1.20, lease time 1d
Feb 2 09:55:15 dnsmasq[16599]: read /etc/hosts - 5 addresses
Feb 2 09:55:15 dnsmasq[16599]: read /etc/hosts.dnsmasq - 1 addresses
Feb 2 09:55:15 dnsmasq-dhcp[16599]: read /etc/ethers - 1 addresses
Feb 2 09:55:15 dnsmasq[16599]: using nameserver 209.18.47.62#53
Feb 2 09:55:15 dnsmasq[16599]: using nameserver 209.18.47.61#53
Feb 2 10:02:08 dnsmasq-dhcp[16599]: DHCPINFORM(br0) 192.168.1.19 3c:a9:f4:5a:9d:30
Feb 2 10:02:08 dnsmasq-dhcp[16599]: DHCPACK(br0) 192.168.1.19 3c:a9:f4:5a:9d:30 Kathy-T530
Feb 2 10:04:13 dnsmasq-dhcp[16599]: DHCPINFORM(br0) 192.168.1.19 3c:a9:f4:5a:9d:30
Feb 2 10:04:13 dnsmasq-dhcp[16599]: DHCPACK(br0) 192.168.1.19 3c:a9:f4:5a:9d:30 Kathy-T530

 

[n2ubp]

I went back to 3.0.0.4.276 and now the connection between the router and modem is rock solid. I see there are newer version of Merlin and Asus sourced firmware. Think I will stick with 276 for awhile until I'm sure a newer version from one source or another is a better choice than 276.