I'm new to the whole brewing business, and I've recently put on a batch of coopers larger. All was going well, the airlock was bubbling nicely for the first few days, then that stopped and the hydrometer reading steadily dropped.
The problem is that the hydrometer reading has stopped at 1.012 (instead of the usual 1.006), the beer is still sweet, and there is still a layer of sugar sitting at the bottom of the carboy.
The beer tastes fine except for a bit of sweetness, the temperature has been kept between 22 and 24 degrees C constantly (I believe this kit uses an ale yeast, 21-28 degrees C was recommended). It's just like the yeast has packed up and left before finishing.