Originally Posted by rootSU
The logical way would be to reset and install one app at a time, but its a long process.
Could do that or use Greenify and a task manager to see what's running, and to auto kill everything but the essentials with Greenify. Task manager would only be for checking running processes. Grab rom toolbox, it has a task manager and an auto run manager. If I had to guess, it's something that has no business running all the time anyhow.