Darn, a gateway. They don't have event logs as far as I know but you can look up signal levels at 192.168.0.1 >login > Connection > Cox Network. The UI is hard to copy/paste. Main thing you want to look for is your downstream is +5 to -5dB with SNR above 35/36. Upstream should be below 50dB.
Also, do you lose phone service when you lose data service?