This can be caused by the monitor's higher pixel clock needing the card to run at a higher speed. If the card's GPU downclocks too far, or if your frame rate drops too far below the 144Hz refresh rate of the  monitor.

In the Nvidia Control Panel under 3D Settings, change the Power Management setting to "Prefer maximum performance". You may also need to set "Multi-display/mixed-GPU acceleration" to "Single display performance mode".

Enabling VSync can also help, as well as lowering the refresh rate if you are not getting close to 144 FPS.