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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.
@Gordon
This does look pretty strange - if the power was getting disconnected then you'd expect the Pico to reboot as well, not the lights to just flicker. About all I could think (if it is a hardware problem) is that the Pico has been shorted out at some point and the diode that transfers power from USB got fried.
As @Chris said, can you type
dump()on the left-hand side and see what it says there?Also, you could try downgrading to the previous firmware to see if it really was the upgrade that caused the problem. Go here and find the version you want - files should be of the form
espruino_1v##_pico_1r3_wiznet.bin. Then right-click on it, copy link, and paste it into the text box under 'Advanced Flashing' in the Web IDE's settings page.