Towing a heavy load can overheat the battery and motor causing it to protect itself.
It was a 504 (speed tamper) error. Not an overheat/overload one.
Do you have any actual data showing planatery gears don't work.
You're the one trying to prove something (although I'm still not sure what). I would suggest you try and find an example of a planetary gear working without errors on a Bosch Gen 4 or Smart system.