I have a Galaxy S7 Android 6.0.1 on Verizon. Hardly any third-party apps. I had a strange issue with the ringer turning on after receiving a phone call. I put it into Safe Mode, and the issue didn't happen. So, I started removing any third-party apps that I thought could be causing the issue. Removed an app, restarted, tried calling my phone, same issue. Once I uninstalled the Sophos Mobile Security app, the issue went away. I re-installed the app and the issue came back.
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