@Nurga 

You mentioned you just installed this router. Do you happen to have your previous router? If so, if you connect that and leave it for a couple of days or as long before the AX started losing connectivity does it still happen?

@Nurga 
I have been seeing this same thing.  Modem from Spectrum stays up, led on Router says it can't connect to the internet/WAN. I've tried using the spectrum modem and haven't seen this same type of disconnect/lost packets.  I do not like the Spectrum router for wifi, so i bought this AX1800 locally and have had trouble since I purchased it.  I am V1.2. It is random,  I have had the internet company come out a few times to make sure there was not some issue after the router that might be causing the issue, assuming the cable modem was more fault tolerant in it's indication of WAN status.  I've observed packet loss to the ax1800 router via cat5e hardwire and pingPlotter. These are generally short outages (.5 seconds usually and 1-2 seconds at most), however this makes video communication and anything requiring a stable server connection unreliable, at best.

@uni 

It could possibly be related to the MTU settings?

From what I saw the recommended MTU size is 1472. Our routers have 1500 set by default (Advanced > Internet > Advanced Settings)

Another thing you can possibly try if you have a cable modem is to look at the modem logs. Any record of critical 3 or 4 errors indicates there is an issue with your service signal which gives random dropped connections.

@Nurga 

I notice it has been awhile since the original post, so I do not know if this is related, but it seems many TP-Link models are suffering the WAN disconnect issue at the router, and if this is related to the following forum, beta firmware recently made available may fix your problem.  See the following forum (ignore the AX20 in the title, that is just what kicked things off....see your model in the beta firmware list):

https://community.tp-link.com/us/home/forum/topic/522208

@Dbam99 

Did the beta firmware fix the problem? I had an AX20 for about six months before it started dropping the wan connection to the modem. TP-Link sent an RMA and it does the same thing.

@Nurga @rick2000 @Dbam99 

Thanks for the info on this thread as I've had same issue on my AX1800 and thought it was an issue with my router so I tried multiple cables from my router to my Google fiber connection yet it didn't fix the issue so over the weekend i did a complete reset.  I did however receive a firmware update about 5am this morning when my auto-update alerted of one.  Did you guys also receive one and being there is no reference to it on the main page for the ax1800, I'm assuming it was a patch to fix this disconnect but wanted to verify such or if I still need to download that beta firmware.

Here is my current info:

Firmware Version:

1.3.5 Build 20211231 rel.64080(5553)

Hardware Version:

Archer AX1800 v1.20

Thanks again for the info and hopefully this issue has been resolved for all of us.

  @Kevin_Z I'm waking up an OLD thread to report a similar problem with my AX20.

My AX20 is connected via ethernet to an AX73 on AP mode. AX73, in turn, is connected to a GPON modem.

All my devices connected to AX20 loose their internet connectivity for a few minutes (connected to WiFi, no access to Internet). No such problems on AX73.

Here are the HW and FW versions of both routers.

Archer AX20 v1.20

FW: 1.3.5 Build 20211231 rel.63820(5553)

Archer AX73 v1.0

FW: 1.2.1 Build 20220316 rel.35540(5553)

Could you suggest a way to sort this out?

--Abhishek