A “flash” of light appears at the start of each motion recording

Hi. Have had my new doorbell 2 for approx 1 week. Re the above header - by the time the video clip has "settled down" it is impossible to view the persons face etc, as they have either turned around or enterred the house. Not an issue at all for household members, but as and when any bad guys appear, it will be pretty useless, unless i can fix this - any ideas?