iPhone 7 weird ticking sound after sending message sound

Hi,

I am using an iPhone 7 for 4 days now and yesterday I have, after I send a message (either using iMessager, Wechat or Whatsup), I have start noticing a weird ticking/click sound right after the app sound. This weird sound is like a small distortion in the speaker that happens after a certain sound is played.

Is anyone experience the same issue?

Thank you in advance.

Best regards,

Ricardo