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I was just considering the frequency (10 s) at which data were logged.
Also, just powering out is a problem, it really is a matter to keep power on for the SD card's controller.
In case of power outage, or pulling out the power cable, a few seconds after a write you might find some symptoms like those described by Espruino_user_dk.Of course an unreliable power supply is a problem more critical.
By the way, some SD cards do need almost 200 mA during writes or there too.
Wifi SD such as Toshiba's Flashair are also requiring 200 mAsustained during all of their connection but this is due to Wifi itself and these are not microSD.
asez73
Thanks for the info - on the Espruino board the SD card's power comes straight from the 3.3v line - so turning off the power too quickly isn't going to be a problem for it...
I think it's most likely a voltage level problem...