Some SVD implementations can fail to converge; https://arxiv.org/abs/1707.07803 and http://www.stat.umn.edu/macanova/htmlhelp/node332.htm and https://stackoverflow.com/questions/24966691/catching-exception-error-svd-failed-to-converge and https://groups.google.com/forum/#!topic/gensim/pOi60wIs1Nw
It would not surprise me if Mathwork's implementation can fail to converge -- indeed, there is a svd::svdNoConvergence error message in the message catalogs.
