Hi guys, My ipad is producing a hissing/static noise when the speaker is activated, it can be heard if I put my ear up close, as far as 15 cm away. The hiss stops after a while, can be anytime upto 30 seconds before the hissing stops. I heard a pop whilst watching a youtube video and think it started then. Please out your ear up to your ipad when typing, can you hear a ssshhhh sound? Thankyou.