http://thedroidguy.com/2015/09/sams...ent-snapchat-issues-plus-other-issues-1049338
PREVENT DIAGMONAGENT FROM SENDING REPORTS
Problem: I recently got a Galaxy Note 5 and I love it. My only issue is after every call or after an undetermined amount of time, a process called DiagmonAgent sends a report. It has a notification on my lock screen and my status bar telling me this. It doesn’t say what or where it’s sending it, but I can’t hide or stop it? I’ve been playing with it since day 1 and I can’t figure out what this is. If you could help I would appreciate it. Thanks.
Workaround: The DiagMonAgent is a core service that is usually attached to your Samsung account. That said, if your phone is not rooted, you cannot get rid of it. There is, however, a workaround that will work for users like you who don’t want to tamper the firmware and that is Greenify.
It is a third-party app that you can download for free from the Play Store. Once installed, all you got to do is “hibernate” the DiagMonAgent so it will stop sending reports every after you finish making/receiving a call. Don’t worry, the service isn’t deleted but “frozen” and hibernating won’t cause errors in the system. In other words, it’s safe.