I am a licensed registered professional civil engineer.
A staircase pattern indicates lack of support and a flexing or settlement of the foundation. A straight up and down crack is on most block homes here but is normal expansion and contraction.
Since the primary ground soil here is sand, it is very easy for sand to be washed away with rainwater from the roof or sprinkler leaks.
So yes, call a professional and determine how to restore the foundation support.
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