My internet has been on and off randomly in Arizona since Cox did overnight maintenance a couple days ago. It only happens during the day. Once the sun is down, it stops. My phone, and smart TV lose ...
I wonder if it could have anything to do with high-split upgrades in your area. What model modem do you have? Did you notice the upstream light go blue? Check your signal levels for a upstream OFDMA channel.
So you don't lose any lights on the modem when you lose service? What about phone service? Do you lose dial tone? If so, check your event logs at 192.168.100.1 for any T3/T4 errors or anything else that is critical.
That is odd. I thought the only way to get the TM3402 is to have Cox phone service. Do you just not use it? Either way, it seems to be effecting wired and wireless, so I wonder if it could be a issue with your router. What model router is it?
Try connecting a PC direct to the TM3402(don't forget to power cycle) for a bit and see if the internet cuts out then.
Anyone know if the TM3402 keeps event logs at 192.168.100.1?