Restoring factory settings while keeping contacts?

Hello everyone.

My phone started behaving weird.. it keeps switching to vibrate by itself. I'm not sure yet whats causing this but I searched around and I found that it might be caused be some app. So I'm thinking about restoring factory settings, but I want to keep my contacts intact.

The thing about my contacts is that I spent a lot of time joining people's phone numbers with emails, Facebook accounts.. etc.. I tried to export a backup using Contacts app but it said some info fields might be lost. So I'm wondering if there is a way to keep contacts as s after resetting the device.

Thanks in advance,

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