@Kevin_Z I have read the thread you pointed me to. I am surprised that the solution to the buggy QoS feature of the router is to not use it/disable it. It is clear that your message is that QoS is only intended for < 250mbs internet speeds but then that shows that the UI of the router is badly designed (IE. allows option of limiting speed up to 999mbps but only works up to 200+mbps?).

I thought a firmware update by now should have fixed it or at least still in-work. It is not working properly and you have no plans to fix it - this is what it looks like. Thank's for the response though.