ASUS RT-68U WIFI drops in the presence of another ASUS RT-68U

I am seeing a very interesting phenomenon at home. I have 2 T-Mobile Asus AC 1900 routers that I flashed to ASUS RT-68U (following the guides online). I used an image from ASUS released earlier in the year. They suffered from some instability with the wireless dropping (on my phone but not on my PC; however, PC lost connection to the internet) but I was not able to pin point whether it was the AT&T fiber gateway or the ASUS RT-68u(s). I set them both up in an AiMesh configuration and they...

ASUS RT-68U WIFI drops in the presence of another ASUS RT-68U