Iphone 6s plus lag after unlock screen
I Bought my iPhone 6s Plus(128g) one week ago,
two days ago,I found that my iPhone will lag after I unlock it.
After the phone is in stand-by for some minutes when i unlock it keeps frozen for few seconds, screen lags, satus bar disappears, etc...
and I went to Apple Store fairview mall to exchange FOUR times! But it is still happen on each brand new iPhone 6s plus