I was able to get my hands on some late harvest unpasteurized cider this year so I decided have a go at my first batch of hard cider. I bumped up the gravity by adding about 4 lbs of dark brown sugar for the 5 gallon batch. it came in around 1.085 and I used WL 775 cider yeast. It took a few days to get going because I dosed it with potassium sulfite but after a day or two it started fermenting nice and strong and after about 4 or 5 days seemed to be slowing down. Then all of a sudden, after it seemed the primary fermentation had halted, I started seeing the airlock going crazy again. Has anyone ever seen this? I'm guessing its not a bad thing, I would just like to know if its normal.