Diagnosis
This is a temporary signal loss, often triggered by variable refresh rate (VRR) handshaking or an unstable overclock. The M27Q X supports AMD FreeSync Premium Pro and NVIDIA G-Sync Compatible modes.
How to Fix It
First, disable any GPU-driven overclocks. In the monitor OSD, navigate to Gaming > Adaptive Sync and ensure it is set to On. Use a certified high-bandwidth DisplayPort 1.4 cable. In Windows, set a fixed refresh rate (e.g., 240Hz) instead of a variable one temporarily to test.
If That Didn't Work
The issue may be related to the DSC (Display Stream Compression) used for 240Hz at 1440p. In your NVIDIA Control Panel or AMD Adrenalin software, try changing the output color format from RGB to YCbCr 4:4:4 or reducing the refresh rate to 144Hz without DSC.
Heads Up
If you are using an HDMI 2.1 cable, ensure it is a certified Ultra High Speed cable. Inferior cables cannot sustain the high data rate required for 1440p at high refresh rates with VRR active, causing dropouts.