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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.
@AkosLukacs
I think the M5 Stick doesn't have PSRAM at all. But still, should work without it.
Does it work for two minutes? If yes, than it might be a hardware issue (bad solder joint, dodgy cable, or anything like that) that only shows up when the board heats up.
Can you verify the hardware with arduino or micropython?