I did a screen recording of this last night. The WiFi signal is constantly flickering between 2-3 bars, even when I'm less than 10 ft from my router. My 7 Plus, MacBook Pro, and iPad Pro all work with 3 solid bars throughout my house. The X has been slow and unreliable in terms of WiFi performance all around. I thought maybe things would be different at my college, but I can confirm it's just as bad there too. I contacted Apple today, but they want me to do troubleshooting at home, so it'll have to wait till tomorrow.
https://imgur.com/a/u8VBs
https://imgur.com/a/u8VBs