Hm, I upgraded it today from the previous Asus version and all the LEDs are off. Also no more system log flooding with kernel: netlink: 12 bytes leftover after parsing attributes in process `ip'. So far so good.
With Merlin 388.1 I had problems with 2.5G devices. Whenever the router reboots my NUC server's Asus USB-C2500 USB to 2.5G adapter remained dead/stuck until I disabled/enable it. The adapter was connected to the router's 2.5G LAN port. Also remaped the WAN port to the other 1G USB to lan...
I am currently using the GT-AX6000 and two Windows PCs connected to the router's 2.5G (WAN)/LAN ports. The first PC uses a Realtek 2.5G onboard NIC and the second PC (Intel NUC) uses an Asus USB-C2500 USB to 2.5G adapter. It is actually possible to use the GT-AX6000's WAN port as a 2.5G LAN port...