This is (for me, anyway) caused by a routing problem within Charter's network. They inject a redirect to a page to try to force you to agree to terms and conditions. That page is on 24.217.29.129. For me, that IP is unreachable - a traceroute shows a routing issue inside Charter's network - a packet bound for that address ends up bouncing between 2 of their routers and eventually the TTL expires. Their useless troubleshooting chatbot will just want you to reset your cable modem, which will do nothing but waste your time - the problem is inside Charter's network.
SOURCE: cable modem
Go and buy a router. Plug your existing modem into the WAN port and your computers into the LAN port. You could even get a wireless router and connect your upstairs computer wireless. Be sure to lock down your SSID (Wireless Access Point Broadcast Name) so your neighbors or people driving by don't get on and do bad things on your network.
SOURCE: how is Arris Telephony Modem installed?
Hi taldrich6 - You have this listed under Arris CM450. Is that what you have?
SOURCE: Problem with my Arris Comcast cable modem.
I just had a tech out yesterday regarding this problem on a TM402 - restarts under high network saturation (big uploads or downloads). According to the tech, this is a know issue. Comcast upgraded their network to support multiple carriers (called channel bonding) dynamically. Due to this upgrade, when your modem is demanding high bandwidth for large downloads, essentially, it requests an additional carrier (or channel)...when that request is initiated, the modem's hardware (and firmware) can't connect to more than one channel at a time, therefore, it "gets confused" and restarts itself to attempt to fix the problem. I upgraded to the TM602, and the problem is still there. This is because the channel bonding feature requires a Docsis 3.0 capable modem. The Arris TM702 is the first in the Arris line to offer docsis 3.0. I called Comcast and they are upgrading me to the Arris TM702 (which is a 50M down/10M up service, btw) for an additional $30/month - well worth it for the stability which I require.
As far as Comcast saying that it's fine, call them back with the information I provided, and ask to get you to a tech who can better service your needs...unfortunately, the "tier 1" techs don't have a clue.
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