2017 MBP screen flashes green or yellow when waking from sleep Ive got a 2017 MBP 15". I have File Vault enabled. 

When its been sleeping and I wake it, the screen flashes either bright green or yellow for about a second before going to the login screen. Is this something to be concerned about? The machine is still under warranty, but i dont want to take it to the Apple store unnecessarily.

Ive noticed this only happens after waking the machine from a deep sleep, if i close the lid and re-open it after about 20 mins it does not happen.

Im running OSX 10.13.6
What version of macOS are you using? High Sierra + Metal did cause some issues. There is a Reddit thread about it: https://www.reddit.com/r/MacOS/comments/73nc9h/after_high_sierra_weird_colors_when_waking_up/

It is a software problem. Double check to see if the OS is updated.

Definitely visit the store if this persists.