Official comment
The log file is showing that it was switched out of programmed flight mode. It shows that the flight mode was switched but then it also shows a bunch of semi-scary errors that seem related to the GPS.
Here are the errors:
dji_check_fc_takeoff_failed_unknown_error
dji_check_fc_gps_reason
These errors repeat until you land so something wasn't happy onboard. Keep an eye on the Aircraft Errors panel to see what is going on and maybe get your aircraft checked out.