Hi,

  We recently went through an exhausting excersize with tantalums.   The
  vendor we used to assemble a small lot was not using pre-heat at the
  wave solder.  The tantalums were thermally overstressed.  When
  testing at ATE, we experienced some firecrackers.   After a back
  and forth with the component manufacturer I became convinced that
  these tantalums(can't speak for all)  were damaged from excessive
  heat.   Well we beat up our assembly vendor and also learned something
  new.

  Good luck

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