Plaster cracks around staircase

We had all our walls skim-coated when we renovated 10 years ago. They are still fine EXCEPT for the staircase soffits and adjacent walls where I’m guessing the movement of the stairs creates stress that re-opens old cracks. Has anyone else had this problem and how have they fixed it? Also, I’ve seen Junior Prates recommended here as a plasterer (most recently in the last day or two). Would he be a good guy to call for this? Thanks in advance.

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