Red Hat 8.5 Blank screens after OS goes to sleep

Hello, I am on RH 8.5 with NVDIA Graphic adapters. After the OS goes to sleep and I refresh my system by just moving my mouse or hitting my keyboard, the screen show blank, no GUI.Even remoting in via Teamviewer gives me a blank (black) BUT when ssh my station I can operate it BUT not bring the GUI back, the Alt F2 / Alt F1 gives me the login window but logs blank to a blank environment. Any ideas how I can fix that ?

Tanguy