Update:
Well I did exactly what you said I went into saved data and game/App settings and changed game presets from default to resolution mode and the game is now working in 4K again. Seems strange the console would choose 1080p performance mode when set to default I know the ag9 is only hdmi 2.0 and 60hz but still.
Thanks for all your input and help.
Glad you did that instead of buying a GOLD PLATED MEGA ULTRA HDMI cable.