I live in an apartment building and one of the issues I have to face almost every other day is that my 2.4 GHz Wifi stops working near my satellite Deco due to interference from another 2.4 GHz Wifi from the floor above us. The interference is solved by just doing the network optimization thing which changes the 2.4 GHz channel to a freer one. I have to manually do this anytime one of the smartphones without 5 GHz support stops receiving internet. 

I've read a couple of posts here about channel switching where TP-Link staff stated that Deco is supposed to optimize itself but I don't see that happening on my devices. I also had a 58 replies email thread with a TP-Link HQ engineer who tried a lot of things but wasn't able to solve my issue. 

Hence my suggestion is implementing a scheduled system or some sort of automation to the Network Optimization feature.