After my problems with my new 40D, repeated in another way yesterday evening during a booked Kid shoot when the mirror decided to freeze up for about 20 seconds and no image taken - refusing to clear with battery removal and replacement and camera insisting only to work on the automatic modes Canon have decided to replace it. As soon as the shop has the next delivery in it will be exchanged. Having cleared all settings again, today it is behaving its self except for one mirror up freeze, cleared by clearing all settings and starting again. Canon did not seem too surprised and offered the exchange as under two weeks old immediately. Will report back when i get the new one. Fortunately got my shots in an Mother over the moon with the results!