Hi,
Not sure if here's the right place but, seems like some others having the same issue as mine, particularly AC66.
I upgradeed to 378.50 and 51 release and after which, whenever I have 2.4 and 5G devices connected, I'm getting random wifi drops and lan disconnects, and my router just stuck. Need to reboot after that to get it up. Yesterday, the 2.4G desktop upon connection just dropped my whole wifi as usual and corrupted my 5G channel (I can't sign in at all, had to hard reset the router to reconfigure)
I also tried the official ASUS firmware for this router, doesn't seem to help. Initially thought it was a hardware issue, but I did a 1-1 exchange and the problem persisted.
I'm almost certain it seems like a firmware related issue, because I did not add any devices/configure my router settings except leaving at defaults whenever I upgrade and reset whenever I saw the recommendations.
Any kind souls might helping this one out? I'm particularly curious with this issue.