Recently, after upgrading a few of my home devices to ones that support the "ac" wifi standard, I have decided to activate the 5Ghz network alongside with the 2.4Ghz in my router (ASUS AC51U) and access point (ASUS RP AC51). At first I tried setting up two combined channels for my router and ap, but that proved to be ineffective, since the network speed became unbearably slow and unstable. Therefore, I tried separating the two networks into 4 channels (2x2.4Ghz + 2x5Ghz), which proved to be a little more stable, but not significant. What am I doing wrong here? The internet speed is around 75 Mbps. Is segmentation what's causing the slowdown? How can I have both 2.4Ghz and 5Ghz network and keep the optimal speed and performance?