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Solved
RBRE960 Xfinity xFi Conflict
I just installed a new RBRE960 in AP Mode to replace an RBR850 system. For some reason, the 960 seems to be causing the Xfinity XB7 Modem to reset periodically - sometimes every few minutes. It may...
Support gave me some new firmware to try last Friday and it been solid all weekend. They've been great. I'll give it a few more days and if all goes well, I can mark this solved.
I'll look into the cable thing. Seems like a cheap Amazon fix, but I have little hope for that. Why is Netgear sending the wrong cable with a product this expensive? I think the ratings of these cables is based also on distance and short patches don't matter - and I'm tempted to try the oldest 1990s cable I can dig out to force the problem - I just don't believe it is a factor. I have seen bad CATx cables in the past and the symptoms are degraded performance, or they just don't work at all. Never seen one that was intermittently causing trouble or gremlins.
I agree there seems to be a problem specific to the 960 and the xFi gateway, or else a lot more people would be seeing the problem. Xfinity even replaced our gateway to make sure there wasn't an xFi hardware issue and that didn't help. It could be a defective 960. The first kit I got had a dead Sat, so it happens. I didn't have the first kit up long enough to know if it was otherwise stable and wasn't capturing logs at the time.
I have not tried the xFi / Orbi in double router / DMZ mode, but that as a solution is nuts. It might or might not be interesting for more troubleshooting, but I'm not going there unless Netgear Support suggests it and can get some insight into the issue from it.
All these problems started with the 960 - in retrospect, that's clear now. My plan now that I know the 850 still works reliably is to start with older 960 firmware, add one Sat, then see how that goes, then escalate to Support.
I appreciate all the suggestions. What's the best procedure to rollback the 960s after I run down that older firmware? My system was too new to have had an older version.
NG support would be already suggesting the use of the DMZ for the RBR in router mode with another router in front of the RBR. This is common place. This is long time support troubleshooting and recommended for checking as most configurations has the RBR in router mode. IF the ISP modem can't be fully bridged, then the use of the modems DMZ or IP pass thru is something that is recommended. Long standing configuration that does work most of the time. I've used this on occasion as well.
Ya anything can happen with these gateways from ISPs hard to tell.
I would recommend if you can take the RBR to a different location, say friend or family member that has a different ISP modem or service, could be telling and would be recommended to see if the problem follows then possible a faulty RBR could be the cause rather then FW. If the 850 is working and the 960 isn't is telling as well. Try a different location if possible. You seem to be the only one having issues so this kind of points to the 960 and or the interactions between the ISP modem and the 960.
Downgrade the RBS first then RBR lastly. Use a wired PC and web browser. After the downgrade, power OFF then back ON then after all is ready, factory reset and setup from scratch to help to ensure all things are cleared out and the system has a clean slate to start from.
This is also under NG review. May want to begin a support ticket as well.