Since upgrading to firmware 386.3_2, my Internet will not stay connected for even a day.

[DTS]

I think I mentioned this previously, but do you have FIOS and guest wireless 1 enabled? If so, move it to guest wireless 2. There is a known issue with GW1 forwarding DHCP packets to the WAN and confusing FIOS.

Good to know, but I did not have guest networking enabled. I have AT&T fiber. Not sure if that is the same as FIOS.

 

[heywire]

Update. The AC86U with 386.5 fw appears to still have the issue that started this thread.

Weirdly, the AX86U with 386.5 fw has a GUI problem. I cannot access the GUI (even after a reboot), although the device continues to function in AP mode.

How is the latest official firmware treating you, same bug there? If so, send a report to Asus (can't remember exactly where in the GUI, but you can classify your issues and checkbox to attach the log). Remember to powercycle the router after flashing.