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My iPhone there has two problems first the time doesn’t read correctly after i lock the iphone and some time go back , and the second thing my Bluetooth doesn’t work how can i fix that my iPhone is up to date i try to reset it , and restart it . also it doesn’t fixed Please help me

Apperently this is a know issue on the iphone 5s, something to do with the ( Y2 Qwartz ) ( credits to this post Why my iPhone 5c is never on time? )