Hey ,
I have an amplifi 75 and suffer from data connnection all the time ( firmware 2.1).
But then i decided to go back to the firmware 1.01 (through amplifi utility) and guess what
no data connection problems anymore . :)
So try this if you have this issue !
To make sure disable 2.4 ghz on your router ,
most routers can switch between 2,4 en 5ghz