RAX200 not letting some devices connect to the internet via wifi.

I replaced my NETGEAR 1700 router a few weeks ago with the RAX200. It was fairly easy to set up but over the last couple of weeks I found that my Ring app and my Dish receiver would connect fine to the router but would not access the internet. My Dish receiver would show that it was connected but I couldn't get the Alexa remote and the on-demand functions to work. My ring app would not allow me to access the live or recorded video. If I changed my Wi-Fi connection to the ISP router, I could access the internet and communicate with both. After a lot of trial an error with changing router settings and cable changing, I found a possible solution to my issue: 

• I logged into my router
• Selected INTERNET tab in the BASIC menu
• Selected the FIXED IP selection and entered my ISP router IP, SUBNET MASK and GATEWAY information and selected APPLY. 
• Once this was set there was no change in communication with my problem devices.
• I then switched back to GET DYAMICALLY FROM ISP and then selected APPLY.
• After the setting was applied, I now have communication with my Dish receiver and my Ring cameras.
• FW version, V1.0.10.140