That’s really weird case in Mobile Security we change the sound levels only in SMS/Call filter and if you didn’t have that set up, it doesn’t make any sense. It might be some other app(s) misbehaving due to their improper implementation after installation of Mobile Security. We have S3 currently in the office and it never behaved like you describe. I’ll doublecheck, but I don’t think it’s a direct fault of Mobile Security.
Filip