I was having the same issue, every morning my hub would be offline. the 2 things I did to solve the issue are: 1. A factory reset of my Arris SBG6700-AC Surfboard all in one route while the Mesh system is connected and flashing red. 2. I turned off automatic updates. It has been over a week since my mesh has been problem-free and presently my auto-updates is set to wifi only. So, factory reset your modem and turn off updates. Let me know if that works for you.
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