Iphone 6s - Noise

HY Folks,

i have problem with my iphone 6s. I couldn't find a similar problem in the thread.

my iphone makes a tzzz tzzz tzzz low level noise when opening for example the safari app. This noise appears when i open the app and when i scroll up and down for example!

it sounds like a hard drive noise/sound of an pc!

it is hearable for example at night in the bed when its quiet.

does anyone has the same problem?

the sound is coming from the bottom of the phone somewhere next to the speaker and the power port.

i already tried the method with pressing the home and standy by button at the sams time but nothing works!

should i do a complete reset with deleting all the data?

i have the latest ios installed.

please help me!

yours stefan