I agree with Emilio Pisanty that the question should not have been closed as an engineering question, for the reason he gives, namely that the OP is asking for the physics behind a phenomenon rather than, for example, an explanation of a technical feature of his mobile phone.
While the question has some similarities to https://physics.stackexchange.com/q/308331, it is readily recognizable in this case what the cause is, even though the "strange sound" is not described.
Sorry to criticise @DavidZ but I think this is a good example of why moderators should not close questions unilaterally for routine reasons - ie for the same reasons as reviewers. When judgement is called for, the requirement for 5 votes avoids the outcome being skewed by individual differences of opinion. I have complained about this already in When should moderators close questions?