What code were you uploading to it? Do you have something small as an example?
Are you sure it's not just that some bit of code is taking a long time to execute?
@Gordon started
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.
What code were you uploading to it? Do you have something small as an example?
Are you sure it's not just that some bit of code is taking a long time to execute?