All, I'm new here but wanted to report my problem with Version:
3.0.0.4.384_20379. I purchased the RT-AC3100 last June. All was well until I updated the device with this FW version. After that, any changes made to any part of the WiFi sections locked up the router and shut off the WiFi broadcasts. You could go into System Status and see that one of the cores was maxed out at 100%. Doing a GUI reboot doesn't fix it. Doing a red button reset just clears out all the entered info but doesn't prevent it from happening again. The only fix when it gets there is to remove and restore power. After 2 weeks with ASUS support not being able to help, I took it back to Best Buy and they replaced it. Asus responded a day later saying it was a chipset defect and they'd swap it. When I got the new router set up, everything was fine. I was leery of updating the FW but the new FW resolves the KRACK virus and didn't want to leave that exposed. Sure enough, updating to that FW does the same thing to the new router. Any change to WiFi such as changing a password, turning Guest Network off or on or changing a WiFi broadcast channel sends this thing into its same problem. WiFI indicators are lit but no WiFi. Connected devices shows only Ethernet connected devices. I did perform the reset at the back of the unit after doing the FW update but it does not prevent the issue from reoccurring when any WiFi setting is changed.