Hi
ASUSmy, after doing further testing, I can confirm that after I upgrade my DSL-AC52U router firmware to 1.1.2.3_617-gfa1b634 (2018/12/05) at the time of writing, my Killer Wireless 1535 laptop cannot use 5GHz band and 2.4 GHz band also not stable as it will suddenly drop the connection. Today I have serious issue that it suddenly cannot connect to 2.4 GHz band and I have to power off and on my router to get back the connection. I never have this kind of issue all the time until I upgraded to this firmware version. Today I also have keep dropping connect to DSL issue but I'm not sure whether it's firmware issue or Unifi issue.
Currently I completely removed Killer drivers and finally get somehow stable 2.4Ghz band network than before. It will still drop 2.4 GHz band network connection and the download speed is fluctuated up and down wildly though. The current driver now becomes 12.0.0.697. Now I can use 5 GHz band but still not stable as it will suddenly totally no download speed until it’s like drop connection but it’s still connect to router then slowly restore back the speed. But still the download speed not really high as before. I also test it with my mobile phone and it's not really stable specially 5 GHz band. The chance of issue comes from router firmware is very high.
I hope your engineer can work together with Killer Networking engineer to solve this issue better. I also hope I can see the new update release from both sides to address this issue. Killer support email is killersupport@rivetnetworks.com.
Edit 1: Btw is that possible to downgrade firmware version?
Edit 2: Your engineer really need to take this matter seriously. Never release unstable firmware build like this before testing thoroughly at real environment.
Edit 3: I also notice that signature version update always fail. Not sure whether it will have any impact or not.
This post has been edited by optimisez: Jan 21 2019, 12:46 AM