HEVC is not an editing codec. Canon does not care about you editing footage from it's cameras. They only care about recording in the most storage friendly manner. Because you were able to edit 37 out of 39 videos in HEVC does not make HEVC a good editing codec. I could jump in an alligator pit and not get bit 37 out of 39 times, but that does not make jumping in an alligator pit a good idea.
Please let us know if you get better performance with the intra-frame format. Even that might not be enough and may require proxies, depending on your rig, and of course, the footage.
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