The 2.4 quits working about every 30 days. Then, typically, it will quit working again a few hours after the reboot. After the second reboot it works for about a month. I did a reset last month, but it just happened again.
Thank you for reaching out! The Arris SBG shouldn't require rebooting for the 2.4G network to work. It is possible the modem is faulty or it is a settings issue. If you haven't done so already, I'd recommend trying a pinhole reset with the steps here to set the modem in factory settings. Then monitor to see if the 2.4G network stops broadcasting at any point. If it continues to do so, your best bet is to touch base with technical support for more troubleshooting or arrange a modem swap. Keep me posted.
Tony | Community Mod.