I just replaced my modem router to a new TP Link (TD-W8968). Everything worked great, expect for one surprising result. All the devices (iOS, Windows, Android) in my network get a full download speed of 15 mbps, except for my Macs (Macbook Air & Mac Mini) that get a max of 4 mbps! Anyone knows what could be the cause? Also, for some weird reason the upload speed maxed at 0.5 mbps instead of 2 mbps! Even though on the modem setup page it says current down rate is 15 mbps & up rate is 2 mbps.. Any thoughts?