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Internet lost, we either pull and replace network line or power cycle modem to get internet back

Regularly the amber light (Activity) on the Surboard modem goes solid, and we lose internet connection. If we pull and replace the network line the amber light will start its normal blinking and we get the internet back. In rare cases we have to power cycle the modem.

Modem log:

TimePriorityCodeMessage
2013-04-02 05:52:54 5-Warning D103.0 DHCP RENEW WARNING - Field invalid in response
2013-04-02 05:52:54 5-Warning DHCP: Renew: Another TFTP server IP address
Downstream Value
Frequency 831000000 Hz 
Signal to Noise Ratio 39 dB
QAM QAM256
Network Access Control Object ON
Power Level 1 dBmV  
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
UpstreamValue
Channel ID 2
Frequency 29600000 Hz
Ranging Service ID 938
Symbol Rate 5.120 Msym/s
Power Level 45 dBmV

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If you're referring to pulling on the Ethernet cable which looks like a large phone cord that connects the modem to your router or PC that would suggest there is a problem with the cable itself or the jack it's plugged into on either end.