@DKJr 

LOL - I dont even use this router anymore, I use an ASUS router because of all of this. I wish I could return this thing, but I dont trust it. 

@SteveMoz Thank you, I just saw your post, my AC Adapt is also 4000mA (and from eBay) and i am trying out a larger amperage AC Adapter from a old cable modem. It seemed to work fine at the moment with the newest TP-Link 1.1.1 Build 20200714 rel.18254 firmware.

I did have an issue with my 5G wireless not displaying so after install the new firmware, i factory reset the device and everything seemed to fix itself. 

So decided to bite the bullet. 
have done the update to 1.1.1. 
Let's see how this goes. 

@AGSystem 

Keep us updated!!!!!

@Efour Well here is an update that i was not hoping to do.

My 5Ghz now works like a dream. No more random dropping out.
My 2.4Ghz........ well it works but it seems to drop out randomly, and not due to wifi interference in the area. 

There also seems to be a bridging error with the handoff from 2.4Ghz to 5Ghz internally. So much so that it has rendered most of my Homekit devices that require a 2.4Ghz signal useless in homekit. On saying that they work in their native apps but you have to try a half dozen times while you wait for the 2.4Ghz to grab the connection again.

So not totally useless but not as it was before the update or as stable as the 1.0.6 update.

Lets see what Kevin has to say about this one.
Come on TP LInk it's a basic feature of your routers that has been around since the early Archer series, surely you cant have screwed these firmwares up that badly?  
 
 

@AGSystem 

ahhhh, yep....still not upgrading till I hear a lot more about it....not going thru all of this drama again...thanks for keeping us updated...

It's a garbage device. 

@bheywow 

Works great for me. No dropouts at all. 2.4 and 5 g always visible.

Have been running the new version for over a month, I have 53 2.4 clients and 18 5ghz clients, all working flawlessly!