Intermittent screen blackout during gameplay - display signal loss (not server-side black screen)

Bungie Account Name - dj2fan

Platform - Steam (PC)

Description of Issue - Intermittent full-screen blackout during gameplay, approximately every 5 minutes. The screen goes completely black for 1-2 seconds as if the monitor is being unplugged and replugged. Audio continues playing and inputs still register during the blackout. This is NOT the known server-side black screen bug from the Server Slam — the game does not freeze, and it recovers on its own after a brief signal loss.

This same issue also occurs in Fortnite (also Unreal Engine) but does NOT occur in any other games.

Rough Date and Time of issue - Ongoing since launch, occurs every session.

Repro steps - Launch Marathon, enter any match, play normally for approximately 5 minutes. The blackout occurs seemingly at random, often during gunfights or heavy action. No specific trigger identified.

Troubleshooting already attempted:
- Updated NVIDIA drivers (clean install via DDU)
- Disabled G-Sync in NVIDIA Control Panel
- Disabled NVIDIA Reflex and V-Sync
- Disabled Hardware-Accelerated GPU Scheduling
- Tried both fullscreen and borderless windowed
- Disabled dynamic resolution / render resolution set to 100%
- Disabled HDR (monitor does not support HDR)
- Disabled all overlays (Steam, Discord, GeForce Experience)
- No monitoring software running (no Afterburner/RTSS)
- Capped frame rate
- Power management mode set to Prefer Maximum Performance
- Event Viewer shows no nvlddmkm errors or GPU driver crashes during blackouts

PC Specs:
- GPU: NVIDIA RTX 3070

- Monitor: Dell S2716DG (1440p, 144Hz, hardware G-Sync module) via DisplayPort

- CPU: AMD Ryzen 5 7600X,

- RAM: 32GB, Windows 11 Home (Build 26200)

Note: The fact that this only affects Unreal Engine titles, combined with no driver errors in Event Viewer, suggests this may be related to how Marathon's rendering pipeline interacts with DisplayPort signal handling on hardware G-Sync monitors.