@terziyski Could you tell me why is that? Was there any problem with the firmware? Or in my method of installation? Or is it just something else? And anyways, about the version of the firmware. I had a screenshot saved. It was from the tether app, but I installed the driver itself from the webpage. The FW version was 1.13.5 Build 240222 Rel.50991n(5553). Not exactly the same as the version you've mentioned, if I'm not mistaken. But I currently have that exact version on the update page. Waiting to be installed. The beta firmware that the service people installed was 1.12.10 Build 230215 Rel.53564n(5553). Might be a bit old, but it didn't help me with the problem either. I guess they're just going to try to solve it further, or maybe give me a replacement unit when I bring it back to them soon. I've also checked that new beta driver that adds some new features like vpn and stuff. Could that fix my issue? Can you check this screenshot below? I think this was the firmware you were talking about? 

  @terziyski I see, maybe the tp-link employees here can tell me something about it? I was a bit busy today, so I couldn't take it to the service. I'll do it tomorrow, and it'll probably take them another 2-3 days to reach me back.

terziyski wrote

  @D3C0D3R 

 

This can be answered only by a TP-Lin representative - that's why I advised to continue interacting with your local support.

  @D3C0D3R 

Hi, you may try this beta firmware from this thread.

If the same issue, you can still go to the retailer to confirm warranty.

Hi @Marvin_S, thanks for the suggestion but I've already sent it to the service center yesterday. I'll wait for them and post an update here later. 

An update on the issue. The service center called me about the router a while ago. They asked me to take it back, they couldn't find any issue with it. They said it was working just fine. And currently, I'm using it. So far, that issue hasn't happened yet. I'll still probably upgrade to that beta driver as Marvin mentioned. Or I'll probably just upgrade to the latest official driver. I'm still not sure.

Edit: The problem is still there. But this time, it either completely disconnects or it just makes the connection extremely slow. I'm connected to the router with a CAT6A connection, and I can see it sometimes disconnects me. There's sometimes the orange light, sometimes the whole LAN display light is gone. And while it's disconnected, my other devices that are connected to the wifi go offline as well. I've tried the beta driver Marvin mentioned, that didn't fix it as well. I've called the service center again and they asked me to bring the router to them once again. Not that they detected anything the last time, but this is my last hope. Hopefully they'll give me a replacement unit or fix anything that's wrong with this router. I wanted to add, I've tried using disabling IPv6 too, the result's still the same. I've tried changing the DNS servers. Used google dns, cloudflare dns, my isp's own dns, all of them resulted the same. I'm really annoyed at this point. Tp-Link products have never disappointed me this much, my previous experiences with Tp-Link products were always great. Except this one. 

 @terziyski I've already tried that. Seems to be exactly the same no matter what cable I use. I've tried a basic Cat 6, Cat6A, the Cat5E that came with the router, I've even tried changing the ONU. They all resulted the same in the end. The laser I'm getting isn't high either, it's like -21.38 dB right now

Edit: Little update on the issue, it seems to have resolved on it's own. I'm using the beta firmware though, but it still happened after installing the firmware. But after using it for a few hours, it worked just fine. Thanks everyone for your advices.