Hi - I am on latest firmaware & seeing same - 2.4ghz is fine but 5ghz will work for a while but then just stops - searching for the SSID cannot be found yet dashboard show it is on - if I use the dashboard to turn off & on 5ghz then it comes back. This is frustrating. I was hoping the recent firmware would fix it but found not.

Is there any update on this at all?

As since the last 2 firmware updates, I've been having very poor (range, bandwidth, stability) & intermittent WiFi stalling etc on my 2860ac [yes I've reset, checked all settings, checked for wifi ranges and other devices etc)