Installation

EX6100 AC750 wifi range extender - I have been trying to finish installing the range extender through mywifiext.net and every time it gets to applying settings - then connect other devices, check the box and then click connect - it drops out every single time. I have moved around the house and it keeps dropping out with a 404 file directory not found. And I check the Internet in my settings and it's because it disconnects from the extender and connects to the main internet again. Please if anyone can help that would be greatly appreciated!!