Slow speeds with roaming network
I just got a new HTC One M8 which has the wireless AC capability. I am getting really slow speeds on my home network and hoping someone can help.
My current setup is as follows - a motorola surfboard modem hooked up (ethernet) to the new model Airport Extreme (with the AC), from there I have a powerline adapter hooked up to another part of the house where I have the older model Airport Extreme (I think 5th gen) - and I am using this in roaming mode to extend the signal.
This works fantastic for my devices which run on N, and everything flies with little to no issues no matter where I am in the house. But this phone - it is incredibly slow. When I run speed tests, at times I am getting decent download on the phone (20mbs) but getting absolutely 0 upload (literally 0.0 mbs). It works from time to time but is cutting in and out frequently.. So - What I am wondering is, would the fact that the router downstairs broadcasting an AC signal conflict with the upstairs broadcasting an N? I am wondering if the phone is constantly switching from one band to another and causing my speed issues? I tried the wifi on another network which just had an N signal, and had no issues whatsoever so I know it is something to do with my home network.
Again - I don't have this issue with any of my other devices (iphone 5, laptop, Ipad etc) so I don't believe the issue lies with my ISP, just looking for advice or if anyone knows if this setup would cause issues with AC devices? I like having the 2nd router upstairs as it really boosts the signal for my N devices and also gives me the ability to hard wire the PS4, xbox etc - so I definitely want to keep it setup - but am thinking I might need to set it up as a new network and turn off the roaming.. Thoughts? Thanks in advance.