I’m running in to some issues with this combo. The flash seems to fire intermittently. It will work fine when I first turn it on and then won’t fire for a moment (5-10+ seconds or not at all until I restart it). It seems to happen every time I fire a shot and then hit playback or delete. If I don’t do that I seem to be able to shoot without problems, but as soon as I hit playback or change some other settings the flash will be unresponsive. I’m assuming it has something to do with the 5D4 firmware. I should note that I also tried this with my 6D1 and could fire continuously with no problems no matter what I did or changed with the camera/settings. Just wondering if anyone else has any experience with this and if there are any solutions. Thanks in advance.