Your mavic was stuck in "screw the manual mode."
Mavics come preset from the factory in STMM.
Despite the risks to their $1500 investment, People still fly in STMM.
They promptly crash, saying mavic went 'crazy' and in typical entitled fashion, blame
it on DJI, and see that they pick up the chq.
The best advice from me to you when you get your next MP, is:
Pretend that if you crash (reason and blame aside), you wont have a drone anymore, and act accoridingly.
For the record you did take most of the steps to disable STMM, unfortunately just not all.
peace