This is weird...
I have a RT-AC68U (Revision A1, I believe).
I've been using your firmware version 32E4 since mid-April with no issues.
Tonight, I upgraded to 33E7 and even though my Motorola Moto X4 phone is able to connect to my router on either radio 2.4 or 5GHz, it reports that "wifi has no internet access" and indeed, there is no internet access on my phone at all over wifi.
However, my primary PC which is connected via a Linksys WUMC710 Wireless-AC Bridge is fine, so I know that is not true.
I restarted my router and cable modem and I even deleted the wifi connections within my phone and re-connected just in case.
I flashed back to 32E4 and everything is fine again.
Any ideas on how to troubleshoot this one?
Maybe try naming the bands differently and see if it’s 2.4 not working but 5 is fine?