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I forgot to show the number with. so it would make sense for you, should have been 2.93265214797 which is the voltage measured when batteries (3 AAAs) is connected to GND and 3.3V pins. From what you are writing I think there is not enough voltage.
The SD card has been formatted as FAT32 prior to use.
Thanks
Espruino_user_dk
@Gordon
What are the two numbers
2,93265214797, or is it the actual voltage?The SD card will almost certainly draw more power than Espruino does when in deep sleep - and it'll also need 3.3v on the supply rail. What batteries are you running off? You'd really need either 3 AAs, or a Lithium ion battery.
It's possible there's a problem logging to the SD when it's come back from deep sleep, but I'd be surprised - If that was an issue I'm sure it would have been found long ago.