Under the new IPv6 on the WAN side, there is no "Non-Address" option for Connection type of "Dynamic IP". For some ISP, without this "Non-Address" option will not allow you to get an IPv6 address. I...

@mikengail The problem I have was never on the Wired devices. Seem LAN ports does get the full bandwidth when you disable the QoS. However, the same cannot be say abut the WIFI side where it keeps...

@LarryMan Thanks for the tip. I was about to pull the trigger to jump to Asus but now I guess I will sit with this problem for a little longer. Seem no solution other than keep rebooting the router....

@Milobar I have the exact issue on my C5400 v2 as everyone else. The drop seem to happy in hours after the restart. I have tried to disable QoS and AV but it stays slow. Wired ports have no issue...