Sory for post my problem again but this is new er9 from Aliexpress, ltwoo and store from few days are off ;/ Total silence od ther side ;/

problem with er9 one of you have simillar problem (i have PM him).
straight road without any holes, and system go down. This happend with some combination of front from 1 to second and on rear and back. After plug charger system turn on (new battery). happend when i tried to shift both derailleurs at the same time??
Front from big to small and back vice versa.
Yesterday i have test it without gear protection in app (off) and while on FD move from 1 to 2 then all OFF. When gear protection is on i can change at FD gears few times and when chanigng in not smooth system of, this looks like some of protection?? In my opinion FD is quite good adjust at 2x11

53-36T and 11-25T

Thanks for any help