My iPhone keeps making a funny noise?

It's sort of lile a 'ping' sound effect, and it happens about 2-3 times a day but its never at the same times. Some days it doesn't even make the noise (RELIEF! Lol) It's so random, and I'm always terrified when it happens. I think it's trying to tell me it's overheatin or something, so I've sent it to my local Apple expert. I just want to know what other people think of it before I get it back.

It's possible that its notifications coming through

  • Why is my iPhone making a buzzing noise? Whenever I play music or any sound is made on my iPhone 4s (which I have only had a couple weeks) it sounds like the speakers are sort of buzzing. Like the music isn't clear. It sounds like if you were listening to the radio but it wasn't tuned properly. What could be wrong and how can I fix it?
  • Why is my iPhone 5s home button making a weird noise? I know that its a button and that its supposed to click, and it did in the beginning. My phone is less than 4 months old, and recently when pushing the button it makes a cracking or crunching noise. Even if I just push down lightly, like to use the finger scanner it makes the crunching/cracking noise? I know it didn't make this noise in the beginning? Is this normal? Thanks! Apple always has a 1 year warranty right? So, would my phone still be covered?
  • Why is my IPhone 5c sreen making a clicking noise? Last night I was fiddling around with my phone when I realized that the screen is making a clicking noise. Last night it was just off to the side, but now if seams as if it is spreading to the bottom right corner of the screen.
  • Why did my HP laptop start making Iphone text noise message? I was just playing an online game and suddenly it was doing it multiple times, nothing else was opened except for Skype, and Skype does not make that noise.