I msg'd Adrian to see what i can do. 640 is a suspicious number, i wonder if my Raven has dead memory somewhere. I've flown the Raven before without problems but on shorter time duration flights, i wonder if the memory is bad above some address...Yes, very peculiar. Baro was still increasing so apogee had not been detected by the Raven4 at the time recording stopped. I have seen an apogee event disconnect a Raven 3 battery, but there was still get a few seconds more data running off the super cap after the event. There is no evidence of an apogee event in the accelerometer. Voltages and current look nominal for a Raven. The data just ends after exactly 640 frames recorded. Kind of looks like a software glitch.