I'm having some problems. I sold my Apple Airport Extreme to get the tmobile AC 1900 which is supposed to be a rebranded Asus 680 (got it on free lease hence the reason for selling). Using the internet on the desktop directly connected via ETHERNET to the router, browsing is fast and downloads are great. A recent speedtest yielded 120/12.5. But on my iPhone 6 Plus, or my other desktop connected via POWERLINE the ping times are greater than 1100 and the down/up are under 0.5 each. Any reason why this might be happening?