I have updated to Sierra, since then my fan won't stop running unless the computer is shut off. I have checked my activity monitor and it is showing that Asterisk (which I don't even remember ever installing, nor do I think I use, nor can I find the files for) seems to be using 90+% of my CPU. This is crazy. I have NO idea how to stop it. My battery lasts maybe 2 hours, used to be roughly 6 or more. Please help me.