IPhone 6 will not stay on 802.11ac

So I have a brand new iPhone 6 that I absolutely love. The only issue I have about it is that it will not connect to my wireless network at 802.11ac speeds. My home network consists of an AirPort Extreme AC router and an airport express that is hard wired to expand my network and give me more coverage. I have a handful of devices that are connected via wifi and those are a macbook pro, iMac, Amazon Fire TV stick, iphone 5, my iPhone 6 and an iPad air 2. The only 2 that should be running at AC speeds are my ipad and iphone 6. Well my iPad is always connected at AC speeds and has since the day I got it. Never had any issues with it and the speed is always super fast as it holds a strong connection to my wifi network at AC speeds. But when I got my iPhone 6, it never connected and stayed connected at AC speeds. So to diagnose it, I reset my network settings, restarted the phone, even did a full reset and setup the phone as new and it still has the same issue. I have gotten my iPhone to connect at AC speeds but only for a short window before going back to N speeds. I toggle wifi on/off and even restart my phone and it will connect at AC speeds again but it will not stay that way. I have no idea why I am having this issue as all of my other devices connect just fine and my iPad run at AC speeds 24/7. I had my iPhone replaced by Apple already and both the old one and new one had this issue with staying connected at AC speeds. Any help on what I can do to fix this issue? is it a hardware issue on the iPhone 6's or is it an iOS issue that I'll have to wait for a software update to fix? both my iPad and iPhone are running iOS 8.2 by the way. my iPad has always connected at AC speeds regardless of what software version was installed on it. It worked great before 8.2 and it continues to still work great on AC (knock on wood). the iPhone has had this issue both before and after iOS 8.2. And both my airports are running the latest firmware as well. Any help on this is greatly appreciated!!!

Thanks for all of the help. I have already tried this and this did not correct the issue. This issue occurs on any and all apps that I have set to only use Wi-Fi. Below is an example of what I get when it automatically loose connection to a Wi-Fi/wireless router. This is even occurring at my work Wi-fi connection.

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