@mrjgardiner AFTER UPDATE 2.4 STOP WORK AND CANT SEE  2.4  /

now i made this settings 2.4 and work now after reboot.

@Kevin_Z 

Adding my name to the list. Just bought this modem and already regret it for the same problem. Hopefully a fix can be sent out sooner rather than later

Add me to the list as well, I read the reviews on amazon and they warned me that around 6 months this thing takes a poo. Here we are, and yet no answers for the last three months of people posting on this post alone. Does anyone have an answer besides turning off AX....that's why I bought this router....its for the AX and to run my smart home devices and cameras. It doesn't show any strain from running it so why the fk would it quit!

@Tgrever 

Make sure you've got the latest firmware....1.1.1 Build 20200714 rel.18254(4555)

Try a factory reset...when it comes back to life DO NOT change any settings except your wireless passwords. 
 

 Give a separate password for 2.4 and 5g. Don't even change the network names.

After you've done this check you can  access the both bands then reboot.

if it works ok  for a while, if you want to change any settings, only change ONE at a time , save then reboot and monitor.

This is how i manage my AX6000 now and speak as you find it's faultless now.

@bowb4myfeet   Had the AX6000 for less than a year now, 2.4ghz wifi went out today and i read through all the forums and tried everything.  Looks like buying new router, and it isn't going to be tplink.

@Cawsie Did it and does not resolve the problem, my 2.4ghz wireless network can't be seen.  Worked for almost a year, haven't done any changes on router or network equipment, just stopped working.  Noticed when i was unable to access any of my wifi lights

@Ripp Honestly, I gave up on this router shortly after writing this post. TPLink owes me $15 and a new router. They are scam artists and should stop selling this defective product to people until they fix it. I bet you they never own up to the defects of this product. I bought an Asus ROG rapture AX11000 and have not had any issues since. I refuse to even give this tplink router away. I don't feel like giving someone else a headache.

@bowb4myfeet @Ripp

I haven't given up on the thing, mostly because I'm traveling extensively (who knew there's a pandemic?) and the last thing I want to do when I get back from an excursion is to muck around with this thing. I just left the Mrs with instructions on how to power cycle it when it goes wonky.

I'm still thinking (convinced), although I have no exact proof, the problems have some/everything to do with the number/quantity of devices I had on that band. I suppose it could be one IOT device, but other than my irrigation system, I have "multiples" of all other devices...TP-Link/Kasa plugs, Blink cameras, Ring cameras, Wyze cameras/plug/lights, Google Home, (too many) Alexa devices, etc. Unfortunately, most of them are 2.4 only, so I don't have a great deal of options. When I was experiencing problems, I had 60+ on that band (no exaggeration). I re-introduced an old Asus AC firewall as an AP, broadcasting another 2.4 band and a different name, split the devices between the two and I haven't experienced the same exact problems as before. I still experience slowdowns/lag on a regular basis (only on 2.4) while accessing and managing devices, but it remains nothing more than a nuisance at this point.

I've given consideration to other devices, TP-Link and competitors, but I require additional switch ports (more than 4, but less than 8, so introducing a separate switch is silly -- in my mind anyway). I like some of the ASUS 8-port devices (and I miss some of the features that product offering brings), but the notion of AX, Wi-Fi 6, Wi-Fi 6E and whatever comes next makes me hesitant to throw that kind of money at a device during this feeling out period.

It's a shame TP-Link failed to impress me with this router -- I really did want to love it, but I guess they can't all be good at everything. Still, of all the smart-plugs/devices I've tried, tested and tinkered with, their Kasa line has been (and still is) ROCK SOLID.