I tore my entire apart from top to bottom trying to solve the wifi not connecting a RPi3 Roon Player. See this link: Wifi issue on one of my RPI3s [Resolved]
Turns out, removing the Jitterbug I had between the DAC and the RPi3 solved my entire problem. A powered USB hub did not solve for me. So, the issue is still out there. I have contacted Audioquest but have heard nothing back for them in response. JCR