I bought 3 different Arris modems and they all bonded upstream until activated on the network through comcast's walled garden. Once activation was run the upstr

I bought 3 different Arris modems and they all bonded upstream until activated on the network through comcast's walled garden. Once activation was run the upstream sync light changed to show it was no longer bonding upstream. If a deactivated one was plugged in, again it would bond. Previously I had been on a 50/10 tier and when the new business class tiers were released they blamed my trusted old SB6121s for being too old, so I bought 2 newer ones in the SB series and had same issues. After writing the CEO and CC'ing all the techs I spoke to and including links to the threads they gave me a direct engineering contact that confirmed the issue. For the trouble they credited me out 2 months of service.