After a couple of days' tests, I can confirm that the long-press before disconnection of the Web IDE resolve the issue of no-notification.
@JeonLab 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.
After a couple of days' tests, I can confirm that the long-press before disconnection of the Web IDE resolve the issue of no-notification.