Always good to check that with SD cards. They are incredibly unreliable. I've had 2-3 of them fail on me during use within the past few years. In one case I wasn't moving, and the song I was listening to on my cellphone stopped. In another, it was doing pretty much what you're doing.
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.
Does the SD card still read from your computer?
Always good to check that with SD cards. They are incredibly unreliable. I've had 2-3 of them fail on me during use within the past few years. In one case I wasn't moving, and the song I was listening to on my cellphone stopped. In another, it was doing pretty much what you're doing.