Hi Drew,

I think what’s happening is a write error to the SD card, after which the Mooshimeter turns the SD card off for a period of time (depends on firmware version, please let me know what version you’re running) before trying to re-initialize it. The first SD card error may be caused by off-brand SD card as jfoj suggests. Can you try your experiment again with a different SD card and let us know the results?

Thank you
~James