hi guys, just bought my xr few day ago. I noticed whenever locking the screen after use, a red flash appear for about 0.X second before the screen completely shut off.Same thing happen when I adjust the screen brightness from high to low. Did this happen to your XR as well?

Mine one not at the notch there,is the screen colour.
the whole screen become red tinted first before shutdown the screen. For less than 1 second.
I noticed it will only appear when press lock screen & adjusting the screen brightness from high to low, from low to high normal.
will not affect normal usage, but just a little bit irritating. my 2014 ip6+ don't have this problem lol.

From what I search from google, looks like this is a hardware problem. I have the latest IOS.
Some ip8,ip11 user also complaint having this problem. LCD quality i think? Btw, sold my xr and bought 12mini purple.