Hello, I'm new user of TP-Link product

I got a problem with my connection where it randomly disconnect frequently and sometimes the ping spike unnaturally 

Based on my searches, it seems related to wireless channel interference since the problem starts occurring when number of wifi near me increased

by using a software called netspot it seems my wifi is using the channel 11 and quite few other wifi around me uses the same channel which make me assume thats the problem is with wireless channel.

for reference, my problem is very similar to https://community.tp-link.com/en/home/forum/topic/504288

What I have tried:

-restart the device(of course first thing)

-reset to factory default setting

-tried the same sim card on my phone which works good without any issue

-tried different sim card which works well on other device on my M7350, same issue still randomly disconnect

What I need help with are:

-how do I change my wireless channel? every time I try to change it there will be error message

"Wi-Fi channel has switched to 11 to avoid interference between Wi-Fi and LTE."

-If the problem is actually caused by something else, how do I fix it?

It is very annoying since its happen very frequently for example I got reconnected 3 times already writing this post LOL