Dylan Adams <dylan(dot)adams(dot)work(at)gmail(dot)com> writes:
> [ persistent occurrences of index corruption ]
> My primary question: is this normal?
No. It does sound like you're managing to tickle some bug or other.
Can you extract a test case of any kind? We could fix it if we could
see it happening, but there's not enough information here for that.
regards, tom lane