Extended wifi disconnects

I have a Netgear EX6100, and the wifi speed is incredible. There is just one problem. My mobile device will not hold a connection with the extended wifi. We bought an extender specifically for access to Internet in my room, and the speed is fast. The extended wifi will just disconnect every time I try to use an application that requires Internet. I have used my mom's phone and my laptop to see if they do the same thing, and they do, and it happens through the whole house. I have tried moving the extended closer to my room, and in several different locations, and it does the same thing. Can anyone tell me why I can't use the extended version, but my normal wifi works perfectly fine? (Also, if this helps, I used Genie Smart Setup to create a connection- I was thinking maybe I should get my wifi protected and change it to WPS setup?)