Our technical team has advised that there is nothing wrong with your cooktop.
While cooking on Induction, you may hear certain sounds like humming, buzzing, or even rattling of cookware.
Sometimes these noises can be shrill or unpleasant but they are completely harmless. These sounds are perfectly normal and you don’t have to worry about your induction cooktop or cookware.  Noise development does not cause any damage to either of them. 
Secondly, noises created by induction or cookware are not material defects.
Noises can come from different causes. It is either the cooktop making humming noises or buzzes or the cookware or the fan that is built into the cooktop.