51. "The 2.4GHz and 5GHz is about the WiFi freq from the router, but" In response to In response to 5
it's also about which wireless standards your devices can use (802.11a is 5GHz...but is slow). There's interference from everyone using the same channels in the 2.4GHz space, or worse yet, someone choosing a channel that overlaps another channel. The signal attenuation you get when not using beam forming (802.11ac) when on 5GHz the further you are from the wireless router. Happens when using 2.4GHz, but the signal loss isn't as bad. These lead to low signal to noise ratio, which lowers your transmit rate.
Sounds like you have a solution to your problem, but a lot of things to consider with wireless...it isn't just about the GHz.
~~~~~~~~ A bad Samaritan averaging above average men (c) DOOM