How are you copying the files to the Mac. There have been some issue with cheap card readers causing corruption — I’ve experienced it. Also, years ago when I bought a Canon 5D there was a firmware incompatibility with my Lexar cards (I know you have Sandisk), but a quick call to them and they swapped my cards with ones with newer firmware and I never had corrupt files again.
Obviously there are a million different reasons why these things happen. This is just my experience.
Warren Eig
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