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A little nervous first time sharing any of my ML RAW content on the forums. Feedback welcome.

This is a short cut of some footage captured on a Sunday afternoon trip to the tidepools in Dana Point. All footage was shot in 1080p mode, 12bit, 2.39:1 aspect ratio using the latest ML build from Danne. Everything was shot wide open using a fader ND to control exposure on a Canon 24-105 f/4 L Mk I lens with Viltrox speed booster for an effective aperture of f/2.8.

Post workflow was MLV App to ProRes 4444 with Arri Log then into FCP 10.4.9 for edit, applying LUT, and grading.  This is the LUT I used: F-6800-LOG available for free from https://luts.iwltbap.com/

Just about a week ago I tried Lexar (I think it was 1800x or something very similar to yours) and experienced exactly the same behavior.
A bit of remedy was to use "Warm up card" option in menu. I think 256MB size worked for me.
It improved the issue a lot, but occasionally the card was still not able to start recording at higher speed. Also boot up time was much longer due to "Warm up" setting.
I also tried Samsung Evo with very similar issues.
Eventually I returned the card and ordered Sandisk Extreme Pro 128GB. Never had the issue since.

I just experienced similar issues with one of my Samsung Evo cards and my M for the first time today. They've been rock steady for continuous recording in 14/12bit when used with both my M and my 6D (Use MCMRewire @ 1736 x 976 on the M). Today, it recorded two clips of about 2:30 on the M just fine and afterwards 5 out of about every 6 runs would give me a max record time of 4-5 seconds (even dropping to 1600 x 900 @ 10bit) and randomly I'd get rock solid continuous recording. Power off/on, pull battery, reset ML settings, reset camera settings, turn on Card Warm Up, no difference or pattern I could see.

It was a family outing and I hadn't planned to shoot much at and just happened to have the M and card with ML, so I couldn't do much testing. I plan to do some more troubleshooting when I have time  It's possible the card is going bad, but it's probably only the 4th or 5th time I've used it. I should probably just quit being stubborn and buy some Sandisk cards...

Also, I've got two Lexar 64GB 1000x cards that have never worked right in my M with the SD overclock.  They work very well when used with my 6D however. Never figured out why.

P.S. This is my first post here, though I'm no stranger to ML.  Long time listener, first time caller sort of deal... I can't post with out a shout out to the community here and the incredible knowledge, talent and accomplishments pushing the limits of what this amazing little camera can do. Thank You!