Thank you so much for getting back to me.
Software versions are the following:
Android Version: 6.0.1
Build #: MMB29M.G900VRU2DPG2
Hardware Version: G900V.05
Security Software Version: MDF v1.1 Release 6 and VPN v1.4 Release 6.0
Safe Mode has no effect on either of these issues. Both the green flicker on dim light and the difficulty with turning the screen on still persist while in Safe Mode.
Please let me know if I can provide any more information.