This is a fairly old topic, but I am getting the same problem. I
received Mooshimeter a few days ago. Logging (temperature) to a 64GB SD card works for about a day before the meter crashes. Rapidly blinking led and unable to connect. Have to pull the battery to reset (a button would have been a big plus!) A couple of runs have had the same result.
This is using latest version of firmware.
Another slight glitch, the forum clips the left hand column in Chrome on a phone (One plus 2) making editing a little hit and miss!