@TP-Link 

Hi, I have 3* M5 v1.6.0 with high interference. As far as I understand, this issue was raised in 2019 and there still seems to be no response in new firmware resulting in manually setting the channels or automatic avoidance of high interference channels?

  @tojo77 

Hey

The ability to manually set the channel may be both a blessing and a curse, let me try to explain

It sounds like you are in an area with lots of WiFi, likely neighbours have their routers blasting away and taking up airspace.  In the 2.4ghz range you can guarantee this is saturated (it ALWAYS is), 5ghz isnt so bad but can be busy..

The problem with channels setting is, its only temporary!    Most routers have a feature where it searches regularly for a clean channel to move to, lets say for example 48.   You where on 48 but idle when it scanned so it choose your channel as free.  You run the "network optimisation" tool and it scans 48, sees its used now by your neighbour and moves you to 40.

Next day neighbour 3 also moves to 40 as its quiet, neighbour 2 to 36 etc etc..   basically its a moving target

Manually settings channels is a nightmare in most urban setups for that reason, its also the reason your network optimiser is reading BAD all the time.. its only good till one of your neighbours moves again.. take 5 / 6 neighbours and its a skeeet shoot...

Seen this so many times.   The best thing to do is install something like WiFi Analyser on an android device and scan the 5ghz range (ignore 2.4, its impossible to work with).   See what channel you are on and test this over a few days recording the neighbours etc.   If you see one channel that is "free" a lot run optimiser a few times till it jumps to that channel.  

Honestly, manual selection likely isnt going to be the holy grail here.   Some dynamic channel move might be a good idea however!