There is one big difference in our logging setups.. I use my primary phone for setting up mooshimeter and (if i remember ;) ) disconnect from mooshimeter and took my phone with me when leaving my meter to do its thing.
That is why i thought that logging stopped as i got out of bluetooth range.
Still, these symptoms might be related. And my next attempt just after that failed one went fine.. But that time i disconnected and logged only for an hour or something.