I've got a very similar issue with my 1 week old VR2800 coincidentally in Australia too. Basically as soon as I turn on QoS, my previously happily connected PS4 can no longer connect to the PSN network (using the test internet connection on the PS4 itself). No priority was assigned. As soon as I disable QoS, the PS4 connects again. Out of interest, I tried adding the PS4 to a priority group and still not didn't not work.

I haven't been through all of the 40-odd connected devices to see what other services may also be affected by this current implementation of QoS. Its a bit of a showstopper really as I need QoS to give priority to my consoles over the various cloud backups that otherwise strangle my meagre ADSL 2+ connection.

I've got the same issue on Argentina.
When QoS is enabled, no matter the configuration, my devices instantly start to loose connection.
On PC, the symptoms are Chrome showing the ERR_NAME_NOT_RESOLVED error or ERR_CONNECTION_TIMED_OUT error, and an extreme latency on web page loads.
And also other softwares like Skype, or Telegram not being able to establish a connection.
When QoS is disabled, all the issues instantly vanish.

This is a very expensive harware, so an update is to be expected.

i have also this problem, i think an update to fix

Qos is a trash on TP-Link. You can not believe it . Actually Qos is a complex function and what TPlink has is just a simple edition

A router can work well good on Qos? A joke of fun.HAHA

I've had similar DNS issues while QoS is enabled since picking up a VR2800 last summer. I contacted TP-LINK about it repeatedly and they sent me a couple of beta firmware updates to try out but none of them actually addressed the issue. Very frustrating!

I have read loads of negative post on this subject of QoS not working.
Bottom Line, it does NOT work
You will have to wait for NEW firmware to be written.

When I run my anti-virus I get an alert that my wifi password is weak and I have to change it immediately to get rid of network attacks. I read in many [FONT=Arial]grademiners review blogs about the problem tried to resolve, but finally I cannot make it because I am unable to change my passwords and I want to know what the main issue is?[/FONT]

The issue comes from USB sharing. I found tp-link router uses "admin" as default USB sharing password and also the web interface login password. You can change it on System Tools-->Administrator(some model called as Password) option.

I'm using an Archer VR2800 here in the UK, latest firmware, and as per the previous posters, I have similar problems with QoS. As soon as Qos was enabled, all PCs on started suffering from delays when accessing the internet. In browsers this was typically demonstrated as "Resolving host..." messages, delays of 20+ seconds in accessing sites. and I frequently had timeouts when accessing major sites too, such as Amazon, Audible etc.I've tried several changes, such as adding and removing various rules from the QoS table, altering the priority settings, enabling and disabling the 2/5/Guest wireless networks, changing DNS server names via DHCP etc etc. Nothing worked.I tried Antons suggestion too, but this only seemed to effect a temporary change and the problem was soon back after maybe 20 mins or so.I did find however that the problem only manifested itself on the wireless network. Connecting directly via enet, and I had no such problem. I've reported the issues to TP_Link tech support, who have passed it on to the developers. Don't know if/when there'll be a solution though.Question for me now is .. do I keep or replace the router?

I have the same problem

 

any news? or fix