6s+ clicking noise
When i 3D touch with a bit more pressure than usual the screen makes a strange noise. It happens only when i don't use my phone for lets say 15 minutes and when i tap on the rear part of my phone near apple logo sth inside the phone makes a noise like it is vibrating. Another thing, when i shake the phone the same thing starts to make a noise which is hard to hear.
There is no problem with the functionality of the screen but just wonder where the noise is coming from. Also i tested the same thing on a 5s and the rear part was making noise as well. I think sth underneath the apple logo is causing so.
Any idea ? Does it need to be checked by a genius bar ?