Is iTunes the problem or my iPhone?

I got an iPhone 5c in December. Everytime I plugged it into iTunes to sync music it worked perfectly. Recently it hasn't. I will plug it in and it's begin to charge but not show up on iTunes. When it does it somehow disconnects from iTunes. It'd say that my computer doesn't recognize the device or that it could perform faster or to try again. I can't add music to my phone since it'll disconnect the minute it'll start syncing. Any help?

Try updating the version of iTunes first. If not go into your menu on your computer and see if your device comes up there. If neither of these work call apple.

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