XPS 16 9640 stuttering video and screen blackouts

Possible Causes:
Outdated/Corrupt Graphics Drivers: This is a very common cause, as drivers facilitate communication between your operating system and hardware.
Software Conflicts: Certain applications or background processes might be interfering with video playback or display settings.
Incorrect Display Settings: Issues like incorrect refresh rates or resolution can lead to stuttering.
Hardware Issues: While less frequent, problems with the display itself or the graphics card can also cause these issues.
Overheating: Excessive heat can cause system throttling, affecting performance and leading to stuttering. 
Troubleshooting Steps:
1. Basic Checks and Reset:
Perform a Hard Reset: Turn off your laptop, disconnect the power adapter and peripherals, then press and hold the power button for 15-20 seconds. This can clear temporary settings.
Check Brightness Settings: Ensure the brightness is set to maximum.
Connect an External Monitor: See if the issue persists on an external display. This can help determine if the problem lies with the laptop's built-in screen or the graphics card. 
2. Software-Related Solutions:
Update Graphics Drivers: Visit the Dell Support website and download the latest graphics driver for your specific Dell model and operating system. You can also use SupportAssist, a Dell tool that automatically scans for and installs updates.
Roll Back Graphics Drivers: If the issue started after a driver update, try rolling back to a previous version in Device Manager.
Restart Graphics Drivers: Press Windows + Ctrl + Shift + B to force a refresh of the graphics drivers.
Use the Video Playback Troubleshooter: Windows has built-in troubleshooters for display issues. In Windows 11, go to Settings > System > Troubleshoot > Other troubleshooters > Video Playback. In Windows 10, it's under Settings > Update & Security > Troubleshoot > Additional troubleshooters.
Adjust Display Settings: Check your screen resolution and refresh rate in Display Settings. Ensure they are set to the recommended values.
Run in Safe Mode: Booting into Safe Mode (with Networking) eliminates unnecessary programs and can help identify if a software conflict is the issue.
Close Unnecessary Applications: Resource-intensive applications running in the background can cause stuttering.
Update/Uninstall Problematic Software: Ensure applications and games have the latest patches.
Check for Malware: Run a virus scan to rule out malware as a cause. 
3. Advanced Troubleshooting:
Update/Reset BIOS: Outdated or corrupt BIOS settings can sometimes cause display issues.
Perform a System Restore or Reset: If other steps don't work, consider reverting your Windows to a previous state or resetting/refreshing it entirely.
Consider Hardware Issues: If the issue persists, especially after the LCD Built-in Self-Test shows problems, you may need to contact Dell Technical Support for hardware repair. 

To receive assistance from Dell chat support, they need to verify the warranty status and ownership. Then you must troubleshoot with them.  
Click the "Get Help Now" icon on the right to start a live chat session. If already out of warranty, click here for the Dell out of warranty offering.

I had to do a full OS re-install to fix the stuttering.