Bests & Worsts Reviews from Amazon

I'm pretty good with electronics and computers, I'm a programmer. I've owned and used this for 5 months now. I have used this extender off of a Netgear R6250 router, and the initial setup using WPS works fine. It finds my network, sets up new SSIDs for the 2.4 and 5 Ghz bands, and works fine. For a couple months. Then suddenly it stops working. The lights say it's on, you can see the SSID listed, but if you connect to it (I've tested with phones, tablets, and laptops) it will say, 'No Internet Connection', even though the Router LED is green. I've had to factory reset it to get it back up and running. The firmware is up to date. My router settings don't change, I don't move it, it just stops working. I don't have time to fuss with it over and over again. I have some smart home devices that don't automatically switch to the other SSIDs in the house, since this still reads as available, so they stop working. It's too much hassle to keep it running, so I'm pulling it out of use at my house.