Theres a problem with recent Netgear firmwares I have seen where the router tries to act as a DNS server instead of forwarding it to the configured DNS server e.g. 220.127.116.11 or ISP DNS server.Both are too costly.
I had also purchased a Netgear R6350 some months back but didn't find time to install it. Now as my TP-Link router needed frequent restarts, so planned to use the R6350 instead. But I was surprised to see its not working well. My ISP has allocated a static IP to me. But after configuring it, many sites (like speedtest.net) are not accessible and many others (like flipkart, amazon, etc) wont render properly.
Went through all troubleshooting steps as asked by netgear support, but nothing helped. Finally they replaced the device with a new R6350 as well, but even the new one has the same issue.
But using the details provided by my ISP, my existing TP-Link router works perfectly. My ISP bought a tenda router, even that one worked fine. So, they are suggesting me to go with Tenda.
I am not sure what's the issue with Netgear. Now their L2 Support is looking into this and have asked me to wait for sometime.
Try to see if this issue occurs by checking as follows-
1) While connected to Netgear SSID/LAN with a Windows machine try nslookup www.nvidia.com or any other site on command line.
2)If you see that the address of the Server(i.e. DNS server) is sent out as 192.168.1.1 instead of your configured DNS then your firmware has the same issue which bugged me a lot on newer firmwares.
3) Solution would be to downgrade to a working firmware version(Check Netgear forums for people who have found out the working version via trial and error)
or throw away Netgear firmware and go with DD-WRT.
Netgear is kinda like Asus motherboards these days. Superb hardware but crappy software.