@Nextus
Make sure you've purchased the NESPi Case +, the latest revision from RetroFlag.
There were issues reported with the previous case and the higher power requirements of the Pi 3+.
@angry_bucket
I don't think that's correct, but curious to know more about your experience.
RetoFlag's safe shut-down script advises to set this to On before installing the scripts. I followed this and everything works fine (as long as EmulationStation is running).
https://github.com/RetroFlag/retroflag-picase
[Edit] I purchased one of these a month ago - love it.