I’ve only ever had one string break on me, an EBCF IIRC. It was user error. I didn’t follow their unique winding instructions, which may have contributed to the issue, but the real culprit was tuning the D string while distracted but thinking I was tuning the A string. Oh snap! There went that brand new string.To not tell a customer with a two week old string that broke due to what had to be a defect that they were SOL. Dunlop, SIT and others would no doubt replace the string, based upon posts here over the years.
BTW - I love La Bella black tapes, sound great and last forever. Never had a problem with silks on those.