Yes, but these things get exercised a lot more in a run-up to a tapeout. I had to remind myself yesterday that it's to be expected, and that I shouldn't be going bonkers because everything seems to be breaking all at once. A lot of people working in parallel can uncover a lot of corner cases really quickly.
I'm pretty well convinced that this particular error has nothing to do with any changes I've made recently. Netgen seems to continue to work in the vast majority of cases. It does, however, tend to indicate that pathological cases that are missed are not "diminishingly small" as they are supposed to be. You wouldn't randomly happen upon a case with infinitesimal probability.