In general, I can confirm the above behavior of my Nano more less.
It happen to me after boot. And PineAP was off. I try to build a Honeypot with the Captive Portal, to show my colleagues how a potential risk could look like.
Therefore I just pluged it into a Powerbank and normally it should start and provide a Free Hotspot. It did but nobody could login. So I pluged it into my PC to see what happened. But even this new boot was not making the AccessPoint accessible.
And just the reset button fixed it. But that should not be the way. If I use it stealthy in my backpack, it should always run as soon as the boot process is finished.