D-Link Smart Mesh WiFi Router AC3000

Not only is it the worst router, but also the most expensive as I believe this is a quite high end router for a home. It's been giving issues since day 1. The "Smart Connect" feature kept kicking me out of the network every 10 or 15 minutes (from all my devices: phone, laptop, etc). If I was a bit far away from the router it happened more frequently, making it unusable. I turned off "Smart Connect" and it improved a little bit. But not enough. I live in a building so there are many wifi networks around. I guess it was still suffering from some interference so I set up the wifi channels of each network manually. After this, it improved (it was decent enough). Then hell broke loose when I turned on the guests network. Suddenly, I couldn't see one of the 5GHz networks. The other two became super unstable. I couldn't even configure them from the Admin page (http://192.168.0.1/) as there was an error in that page that wouldn't let me see the wireless options! I contacted Amazon (after D-LINK simply ghosted me on Twitter), had to hard-reset the router and then was able to configure it again, and see all 3 networks back. I decided to never turn on the "guests network" again. Too unreliable. And then I tried to reproduce some files using an Apple TV, via VLC and a USB drive that I connected to this router. The router doesn't show all the files via UPnP (for some reason, the SMB option doesn't appear). A way cheaper router (from another brand) that I have, does it perfectly. I didn't see any easy way around this, so I decided to connect back my old router (AC1750), which is way more reliable in all aspects. This router is now paperweight, unless I'm able to get a refund from Amazon.