Why does my iPhone keep deleting my contacts?

Hi, about once a week my phone has a complete epi and deletes all my phone contacts! I will just go on my phone one day and my phonebook says 'no contacts'.It's so annoying because when I try to do a computer back up to regain the information it takes hours. Is there some sort of reboot I can do that will solve the problem but won't delete all my phones data? Or does it need some sort of professional repair?

Take it into your iPhone company. (AT&T, Verizon etc… )

Because its an Iphone… Get a HTC One, or Galaxy S4 and all of your troubles will go away.

I love apple computers but other devices I can't stand.

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