given the issue is showing in pics at 1/250 (from exif) I see no point in testing at higher speeds, it's clearly faulty. I have a suspicion that Canon may not hold spares for these anymore so a repair may prove difficult. Best return it...
p.s. the image of the power meter shows classic shutter leaf rivet failure.
Also not that it matters but the shutter-count is alledged to be 113579 according to an online shuttercount website.


