5GHz connects but not 2.5GHz
I have a curious problem with my Airport Extreme. I bought it used about a year ago so I am sure I won't get Apple's support on this.
So, about a couple of weeks ago, my iPhone 6 plus won't transfer data or very slow. When I use data transfer measuring app, it doesn't even do a Mb/sec. But it's erratic, sometimes it works, sometimes it doesn't.
My iMac and MacBook Pro have no problems connecting and when I do the speed test, it averages out at about 45Mb/s upload and 8 Mb/s.
So, I looked in to it and found that my Macs are on the 5GHz connection and my iPhone was on the 2.5GHz connection. Just to test it out, I connected my iMac to the 2.5GHz connection and it just throttles. When I connect the iPhone to the 5GHz connection, it rocks.
Well, the story is, what can I do to fix this, if at all? I know my warranty isn't valid as I bought this used and I am sure the warranty expired anyways. I can't afford to buy a new one at this time but would like to get if fixed. Any suggestion?
iMac, OS X Yosemite (10.10.2), MacBook Pro, iPhone 6 Plus