Unwanted unlock noise for my new Moto X?

[oliviasbored]

Hi, I have a moto x, under the republic wireless carrier and Ive had it for about a week now. the software is 4.2
For some reason, starting about 2 days ago, it's been giving me a weird noise whenever I unlock my phone. ive even recorded it so maybe someone else has had this problem? Moto x unwanted unlock sound - YouTube
i did not set this up and I don't know how to get rid of it. Its really annoying. any help is appreciated.