My ZenFone is wheezing

A feel days ago I bought one ze552kl, but since I start using it the speakers are making some noise like a wheezing every time a use it with audio messages or videos. What could it be? And how can I fix it?

Thanks
Cesar Piccolo

please update the latest system ...
https://www.asus.com/id/support/Download/39/1/0/28/CHukp94xOkwRMIP4/32/

hopefully if you have finished updating the system ,, no more problems on your smartphone.

Your phone it broken, return it for a refund if possible. More problems will surface as you use it.