If I follow, you mean you can't consistently find it? Well you can jump on your router and reserve the IP address? That's what I do. Next time it boots you'll know its IP which is great for servers and connecting over Telnet.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
As I see, ESP8266 with Espruino onboard cant work in station mode without DHCP on AP enabled? (((