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For the last couple months (roughly 6 or so) my (refurbished) SBG8300 has been randomly rebooting. Sometimes it’s 2pm, sometimes it’s 10pm, on any given day. It’ll  stay up for maybe 4-6 days and then all of the sudden reboot. I can confirm this is what’s happening because the uptime timer restarts. My internet will drop and then my router will have the solid blue light on the internet icon. The reboot takes 5-10 minutes to complete and then it’s back on like nothing ever happened. The device is already connected to a UPS and no other devices connected to it have ever had any power issues.

 

My ISP is Xfinity (unfortunately no other options) and they’ve confirmed everything looks good on their end. We’ve done the whole song and dance of rebooting the signals and my router multiple times but it doesn’t change anything.

I’ve been having this issue with this router for at least the last 6 months and have just been dealing with it since I’m no longer under warranty and unwilling to pay tech support to confirm the router needs to be replaced. Does anyone have any ideas as to what is causing this issue or how I can fix it? Or do I just need to buy a new device?

 

TLDR: SBG8300 randomly rebooting throughout the week, Xfinity confirmed there’s no issue on their end, is my device dying or is there something that can be configured to stop this from happening?

In this case to isolate the issue need few more information,

Is your issue happening on the wired or Wi-Fi connection?

Is your modem rebooting completely like the front LED is going off and on or only internet is dropping?

If the modem rebooting on its own have you tried connecting modem to different power outlet or using different power adaptor?

It's happening to the sbg8300 itself, so both ethernet wired and Wi-Fi connected devices are being affected. 

 

The modem is rebooting completely, the Wi-Fi icon on the front of the device turns blue and starts blinking. When I remote into the web UI, the system information confirms the uptime was just reset.

 

Yes I've tried a different power outlet and the same problem occurs. No other devices on the same power line are affected at all. 

Could you disconnect the co-axial cable and please check whether the modem is still rebooting?

I can't really check this way, the modem doesn't reboot by itself for several days. I can't go without Internet at my house for that long.

 

If you mean unplug and replug the coaxial cable, I can try that and see if the random reboot still occurs.

If the modem is not rebooting without co-axial cable, then the cable might be defective. 

In that case, we would suggest calling your internet service provider to replace the coaxial cable.

 

 

I think you're misunderstanding. I cannot unplug my coaxial cable for up to a week to test this problem. I have to have Internet on my household. The fact that the connection works for 98% of the time is a pretty clear indicator that the problem is not the coaxial cable. 

I am having the exact same issue. I can tell you it’s not the coax cable since I was able to replace the cable and nothing changed. When the internet is connect, the signal is strong, switching from ethernet to wifi doesn’t change anything, changing the wifi cable doesn’t change anything and even after rebooting the device, the problem persists. There is something wrong with the unit.I think mine was also refurbished but it seems to have been supplied by ARRIS

For anyone looking into this ticket at some point in the future, I was never able to resolve this problem. I replaced my router+modem combo sbg8300 device with a separate router and modem from NetGear and have not had a single issue since then. Good luck with your networking!

 

p.s.The problem was 99% a hardware issue considering the device was returned and several years old.

Since the modem was not rebooting without the coaxial cable but started rebooting on its own when connected, we suggested replacing the coaxial cable. If you've already tried all the troubleshooting steps, I recommend visiting www.arris.com/consumersupport for further assistance.

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