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Hi there, I got iPhone 8 on iOS 14.3 . I got weird issue with it - it is fine till I connect it to charger - when it become slow when wake up - then to make it “fast” again - I have to reset it (volume up down power button). It is not liquid damaged - display is Apple BUT - it has “new” non Apple battery . What do you think - is it battery problem or mother board or……. iOS 14 as other people complain about it Thank You Bart