I think it is fixed. I reboot multiple times and only once it flicked black for about 1/2 a second.

I moved my splash screen to /opt/retropie/supplementary/splashscreen/

then I

edited asplashscreen.sh and removed the -b from around line 37 near OMX (that removed a black background that used to be needed to hide post text.

I had to use the command sudo chown on the directory to get write access

well it worked now. Installed it manually over the terminal with the RetroPie script specific options. Thanks for the clue @herb_fargus 😁

@Hex @zulorumX
Take a look around here In last posting @meleu and me did resolve some problems with shutdown and escape emulators by GPIO signal.