Noticing another issue reported on these forums, I suspect the two may be linked. The issue related to the photo format being stuck at 16:9, and not able to change to 4:3. I suspect this may be the reason for the decreased flight speeds (to maintain overlap), and therefore increased flight times. I noticed the odd photo format, and tried changing it in DJI Go, but the change didn’t take effect in DD (I wrote it off at the time, but it seems logical now).