I'm not sure what this taste is, but DH doesn't taste it. I recall it once or twice previously in the last few years. This time I took note of the winemaker and see that it is wine from a reputable winemarker, so I will not mention it, as it smells like barnyard dung. I'm wondering if it is the grenache, although I've not noticed it in other grenache/syrah.
It is just a hint in the taste. You can't smell it.
Yes, I know barnyard dung -- born a hillbilly. Dee Dee