Hi all,

Thanks for your replies

@iGyro: There were unfortunately no windows updates in the meantime.

@Mhaeric: Yup i had read those steps on other posts reporting similar issues.

@meTYE: I re-checked and the dx11 client exe is in the firewall exceptions. Thanks for your suggestion though!

@Dynratygus: This problem started with lag spikes and 90006 disconnects and later escalated to 2002/90002 errors. As i had mentioned in the post i did make several changes and the result is as mentioned.

I do also have some new findings on this topic. Yesterday i reconfigured our router to announce 5GHz on a separate SSID in case that makes any difference. To my surprise, my wife's client works like a charm when connected to this new SSID. Once again, i was happy and thought maybe its just her card not dealing with 2.4GHz and its interference properly. But today once again she has started to get lags on it and now cannot connect with it anymore. She gets 2002 while waiting for her character screen to load.
When i switch her to mobile hotspot, everything works fine again.