Only getting 20-30 Mbps download on extenders. Source router clocks in around 160 Mbps on 2.4 channel and 500 on 5.0 channel. Happening on new 505X extender. I plugged in my old 305 extender and it's doing the same thing. Not a range issue, phone is right next to extender, and the extender reads 4 of 4 lights using Tether device-to-router signal strength utility (even says "you can move your extender farther from your router"). Will try to post photos. Any help is greatly appreciated!