A lot of additional errror/info msg's in syslog generated by new firmware , and devices in app showing as offline when actually working but I've always experienced that since day one. Not noticed any "issues" which would make go back a version but only been on it 2 days.
Maybe a new one won't have issue if they fixed it, mine is 3 1/2 years old. Good luck I've always found support about as useful as an ashtray on a motorbike , post how you get on .
Had this issue on every firmware occasionally, a reboot returns the missing ports , suspect more a hardware fault , tho if some one can say definately doesn't happen under Merlin i'd probably switch.
Sorry but see below extract from CHANGELOG for first 386 release for AC88U
Version 3.0.0.4.386.41535
2020/12/30 40.67 MBytes
ASUS RT-AC88U Firmware version 3.0.0.4.386.41535
1. AiMesh 2.0
- System optimization: one click in AiMesh to optimize the topology
- System Ethernet backhaul mode...
Update on my experience , wifi disconnects/variable signal quality on version 20631 on AC88U , impacting my son working from home , additional mobile data having to be purchased for my wifes phone which doesnt seen to return to wi-fi automatically or as quickly as mine. Have factory reset...
Apparently not , you could block asus servers via firewall (not sure of any other impact on router) , switch to Merlin he doesn't auto update (n.b. Asus seem to switch it off and on when presumably they feel its necessary)
I'm in the same boat , posted here as well since 86u and 88 are similar...
My AC88U has just auto updated overnight for a second time to 20631, I had previously reverted to 20490 as I was experiencing reduced wifi coverage and disruptions numerous times a day, WLCEVENTD reconnects every 2 seconds on an Echo plus which sits about 10 feet from the router and the...
Noticed my harmony hub had red light on and my belkin plug was orange (weak WiFi signal) but both devices are working, rolled back and harmony returned to green and orange light on belkin went out, no time to troubleshoot but something astray in wireless on new version also, will wait for next...