iPhone 8 slow when connecting to charger - and ok when not connected
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