I have made 4 attempts at brewing bottles. First one was flat. I screwed up the conversion. Okay, then the second one was flat and sour. Third one was a different recipe and all grain. Very foamy. I lose about half the beer when I open the bottle. Fourth batch, same recipe, is flat and sour. I've allowed a month for bottling, left at room temp. I guess I have two problems: Why does the beer get sour, and why can't I get consistent carbonation?