Nikon D5100 body making noise when i switch it off?

I never drop my camera before, now my camera start to make this weird noise when i close it. I scared it might be broken. Does anyone know what problem with that?
Btw i still have my 1 year warranty but i buy it at Malaysia and now i'm at UK. Should i just sent to the service centre. I totally dunno what to do now.

Added (1). I'm still new in using dslr and still in learning process, that why i don't really know much.
i upload the sound on youtube, not sure you can hear it or not.

Added (2). Reply:

It happen every time when i turn it off.

It's sensor cleaning and/or the lens refocusing. Nothing's wrong with it.

It could be sensor cleaning.

we need to know what kind of noise it makes, however.

EDIT:

sounds like sensor cleaning to me. That high frequency sound right?

Is your video private? I wanted to hear the noise and see if I could help you with an answer