The control unit for the mirrors and windows is effected by a power down, battery removed so needs to be retrained. A number of Ateca owners have been caught out by this. It also effects one touch closing of windows. Solution as per manual... The manual doesn't mention that it also effects the auto close of the mirrors on locking. From Ateca Electrical System Manual covers it on re connecting the battery It's that which fitters leave off or if you get a flat battery. Worth trying for random events of not working.