Broken rear spring!

What is it about these cars why the springs are so susceptible to breaking? Why so? A BMW design error? Mine did too....
 
I've just changed my rear M-Sport springs (one snapped, one on the way out) and could have sworn that they had three dabs of green paint, not blue... I've replaced them with Suplex springs (specifying the M-Sport replacements) and the ride height is the same. I'll check the old ones tonight.
 
Has anybody seen a definitive source document explaining the colour codes on BMW springs? Just as I found elsewhere on the web this thread has contradictory information :?
 
I had three blue dots on my si sport springs. I had them replaced by BMW (foolish I know) and the replacements didn't have any paint. They had a barcoded label with the part number which I verified as m sport springs.
 
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