I live on the Manchester-North Wales line which is worked mainly by "Arriva Trains Wales" Class 175's. The automated announcement system is usually operating although I have experienced the fault you describe quite a few times. Maybe there is a train driver or conductor on the forum who can explain why this happens and why it can't be corrected once it starts. Talking of the actual announcements, I'm not sure which is worse........the sickly, artificial sounding, pieced together lady's voice or (when this breaks down) the broad Manc voice trying to get to grips with the Welsh place names
John.