Is EspruinoHub up to date? And did you try waiting for ~30 seconds? Sometimes it takes a while for the connection to time out so EspruinoHub can disconnect and then find it advertising again.
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.
Is EspruinoHub up to date? And did you try waiting for ~30 seconds? Sometimes it takes a while for the connection to time out so EspruinoHub can disconnect and then find it advertising again.