I looked at FLY188.DAT and it appears this was an abrupt power loss like what is seen if the battery is dislodged. But, since that appears not to be the case I suspect the battery's internal circuitry is at fault. To be clear, the power loss is so abrupt it's not a case of voltage sag, etc.
By running DatCon at the highest sampling rate and turning off Smart TimeAxis processing it can be seen that the P4 didn't have time to properly close recording the .DAT file.
This causes remnants of a previous flight to appear as the last records in the .DAT. Usually, there is enough data in that remnant to see the GPS date and time data that indicates when that flight took place. Didn't happen here but there is location data from that previous flight.
