Kingfishers and Image Corruption

I borrowed Phil's 400 DO lens yesterday and ran it off my Canon 1D mark IV at Lackford Lakes. Generally pleased with results but, unfortunately a large number of files were corrupt giving very interesting artifacts but not helpful when the best in a sequence always seemed to be the ones not useable.
Here are some Kingfisher images - he (no red on mandible) caught 3 fish - one so small not really worth the effort and hovered a couple of times in front of some reeds.