One thing that is sometimes missed is the seating of the cable guide. It should be sat flat against the steel of the shoe if the lip is sat in the hole correctly, and isn't always obvious. If it isn't sat correctly the adjuster could potentially unwind.
The lip on the guide should also be checked for fractures. I've seen it before when cleaning the brakes. If the lip fractures and breaks, the guide can slip and the cable slacken. The guide needs to be removed to check for fractures around the lip, for flush fit you can try and slip a feeler gauge or piece of paper behind it.
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