I'm sorry I should have been more clear by shooting mode I meant manual , aperture priority etc
I think I know your problem - but will test this when I get back in front of my camera. Using custom modes I'm pretty sure the camera saves everything about that particular setup, shutter, aperture, iso picture style etc. So it wouldn't surprise me when the camera is turned off or goes off automatically that it resets to whatever the custom is set to.
This may have happened to me I've just never noticed, as I often just leave in manual for video but use customs for photos
Robbie Carman
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