@onefortheroad Yes! Exactly the same thing happens to me as well. Even though devices are connected to the wifi , internet does not work. Sometimes you can see the SSID on the devices but you can not connect to it at all. Both happens around the same time at least once a week. Only way to fix it, is to power cycle. I tried looking at the settings if I could somehow schedule auto restarts at night but there is no such a thing.

@Kevin_Z 

1. I did change the wifi names when I was setting it up the first time. I'm not using the default ones.

2. No change on leds, all the leds remains lit, just like it was working. Yes wired connection is not effected by this.

( This happened again yesterday during an online class, I remained connected to internet and to microsoft team call on my pc, which uses wired connection from the adapter, however my tablet lost internet access as well as my phone even though they were both connected to it, which I was editing pdf file to upload.)

Another thing to note, I seprated 2.4 & 5 Ghz wifi bands when I was setting up the adapter (as some devices were not connecting to the adapter). When this problem happens 5ghz SSID stops transmitting usually. I can't see the 5gz SSID on any of the devices, while I can see 2.4ghz on the devices however I'm not able to connect to it.

3. I did change wireless settings, it had no effect. The problem persists.

4. Done that as well, no change.

@Kevin_Z  Has there been any findings on this issue?  

For me it hasn't gone away.  Still no access point SSID showing after about 4 days, until power cycle. 

However I have recently been trying another workaround and I think it's working OK so far: 

Using the user interface I have scheduled the powerline adaptor wifi to disable itself during an unused time e.g. 2AM-3AM every day.  I think I have not seen a dropout since, though I want to run it for a week at least.  @Duality maybe you can try this too if you're still being affected?

@onefortheroad 

Hi,

did anyone managed to find a solution for this issue? :(

@RicardoT 

Hello, now I only rarely get the wifi stack unavailable, with the fix I proposed above.  

Force disable the wifi at 2AM each day, ensuring the tickbox is cleared to force it to turn off.

It's a terrible workaround, and Tp-Link should release working firmware.  I don't understand how they haven't updated the firmware - perhaps the factory firmware didn't do this, and most customers haven't updated?

Here's a screenshot.