I have a 2 week old Sager laptop which recently began to randomly emit 3 loud tones at random. They are about a second in duration and sound very much like a truck horn. I have run a complete scan with Malwarebytes, SuperAntivirus free and Avast. The laptop comes up clean. I'm not a gamer so no games are installed. Muting the sound takes care of the problem. Any ideas what could be this? Thanks for any help.