Ok, so it looks like your channels are on 6 for 2.4Ghz and 44 on 5Ghz?
If so, then your 2.4Ghz is still running on same channels and your neighbors. This is probably causing problems. Lets try channel 11 first.
I see you have a 5Ghz neighbor up on 149 and yours is on 44. This should be ok.
Also you need to change the SSID names from dlink and dlink-media to something else. Something fun can be the name and you can add 2.4 and 5 to the names so you know whats what.
I believe you have a WiFi congestion problem here.