Netgear EX6200 Wireless Issues

Hi All,

Hoping someone can offer some assistance. I`ve moved house and where i have setup my Netgear DGND4000, the signal does not reach the bedroom. To combat this issue i have purchased a Netgear EX6200 Extender and set the device up in the lounge. The problem i have is that i can connect mine and my wifes mobile devices ranging from IOS to Android OS and when we are connected to the EX6200`s SSID be it the 2.4ghz or 5ghz mode we constantly get no internet access from our devices. If i reboot the DGDN4000 and the EX6200, sometimes we are able to get internet access for a short time. I know that this looks like a hardware fault with the EX6200 but i have 3 cabled devices (MediaCenter, PS4 and Seagate Central drive) cabled with CAT6 directly to the EX6200 and all of these devices suffer no internet issue`s whatsoever. The media center is hosting the Murmur server for me and at night it stays up the entire time im playing and talking with friends which can be 3 - 4 hours. This leads me to believe that there are no issues with the EX6200 as the onboard NIC`s are communicating with the DGND4000 over the 5ghz mode without any issues. Im at a loss as to what is wrong with my setup. The EX6200 is setup to broadcast both 2.4ghz and 5ghz modes. I have tried changing it to Fast Lane and it made things worse so i reset the whole device and re-set it up. I also noticed that when i turned off the SSID broadcasting from my DGND4000 that the EX6200 struggled to communicate with the router. 

Anyone have any suggestions or tips?