My beer has spent about 3 weeks fermenting, and something tastes off. I gave it a little taste-test and it seems to be a little too sweet for the amount of time it's spent in the container. That could mean a number of things, but I'm hoping that the yeast just took a little break. Usually, sweetness could mean that the fermentation isn't finished. If the temperature of my beer dropped below 68º, the yeast would stop fermenting. Luckily, once the temperature returns to an appropriate level, the yeast will pick up right where it left off. If this is the issue, all I have to do is allow the beer to sit for a little while longer. However, if things don't start tasting right in about a week, I'll have to scrap it and start over.