One router, dual band, Can connect to only one(either) of two, when using pihole dhcp service

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Apparently more people are having the same issue

Clients connecting to internet on one of bands of dual band wifi

Basic info about my setup: I have mainly been testing on my phone. Pihole is running on a pi 3 B on Rasbian Strech lite, fresh install. It is running the DHCP on my network, behind my Asus RT-N66U router. The pi is connected to my network through the 2.4GHz band. My original pihole started having issues. I did a fresh install on a new board with a new SD card and changed from an Ethernet connection to a wireless connection. My phone is a Pixel 2 XL on the developer preview of android P. I hav…