Good to hear! I never made it more than 7 days without a problem on 380 (with 80Mhz channel width) -- so 11 days sounds real promising. (380 has been rock stable for me since setting 40Mhz, but I'd like to get back to 80 if I can.)
Can you post your 5G settings? I'm particularly interested in knowing if you have 80MHz (or Auto) width set, and whether you have any 80MHz capable clients. But seeing all your "working" combination of settings would be a good baseline since they are obviously working well so far!
5G settings are 100% stock the way the firmware ships, with the exception of MAC address filtering turned on, and obviously turning on encryption. None of the variables previously tested in this thread have been changed from the defaults that are set upon loading. I have multiple devices capable of "Extended Channel Bonding / 80MHz" that connect to this network.