So like the title says, I have a newer Airport Extreme AC (Tall version)and have an older Airport Extreme which is A/N (flat version). The way in which these have been setup in my home for the last few years is the AC's in the basement at the front of the house, and then I have the N router, up two floors in the back of the house. The N router is in extender mode so that the wifi signal can be better on the top floor, as well as about 15 feet in the backyard. As of late I've been having some dropouts etc and have called my service provider. There was an issue with packet loss which they did fix but it got me wondering about if this is the best setup based on where I'm able to place these two routers based on my needs. Also it got me wondering at what point in my house, does one of the routers lock on to my phone or ipad and provide either AC or A/N speeds. I can assume when I'm on the top floor, I'd be at A/N and when in the basement AC. What about the main floor of the house? I've pretty much left all the settings as default and I know I'm running only the 5GHZ channel at 149 and have the 2.5 ghz turned off. I do find speeds on the top floor always to be slow and sometimes I turn off the wifi on the phone and then back on and it fixes it. any ideas or suggestions to make things better?