January 2015, I started a pail of Syrah, Zinfandel, Grenache, and Carignane. No win was ever back sweetened. The wine fermented through no problem and I aged it until December of 2015. I racked the wine three times and kept up with the standard so2 program. When I go an open a bottle of syrah, grenache, and carignane they are have a puff sounds and fizz. I have learned my lesson before with bottle bombs and not stabilizing the wine, but there was no sugar added. Is this maloactic happening in the bottle?
Thanks
Thanks