OH F , really this is terrible news, we went thru this on the Pro Plus controller when I had to call in the Chinese number and the FIx was somehow the CHINESE MAP turned it self on when updating as I was updating on the go without the DJI assistant , now I use that every-time.
This fixed the Chinese Number Phone nonsense. You may want to give that a try for all the Chinese Problems everyone is having and check you Chinese Map did not get turned on.