I am brewing a DIPA. I still had regular bubbling in my air lock when I racked it into the carboy as I usually do. It has now been several days and there has been absolutely no activity whatsoever since transferring to the carboy, and I'm not sure why. I have limited experience, but this has never happened before. So I'm wondering if anyone has any ideas what caused the yeast to suddenly stop fermenting, and also what I can do about it now.