Why does my iPod on my iPhone crash?

Okay so I open my camera (no, it is NOT on video setting, I know the music fades when the video is on) and it just crashes. I have an iPhone 4S, and lately it's been laggy and crashing. Can anyone please help me? It's driving me crazy! Also, it just sometimes crashes all of the sudden. I have turned off the Facebook from your phone thing, because I read that it makes your phone messed up. Please please help.
~Holly Rae

Try deleting the apps your running if you haven't already

"iPod on my iPhone?" That makes no sense.
Go to the Apple website.
Download the manual for your device.
Read it!

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