1. I can duplicate the problem 100% of the time.  I currently have "Monitor off" at 5 minutes and "Sleep" at 10 minutes.  2. I moved the video output from the NVIDIA card to the system board HDMI port and never have the problem, so for sure it is the video.  3. This is not my area of expertise.  My thought was to get a driver from NVIDIA but when I look for this particular one I have a choice between Gamer and Studio.  I'm assuming Studio since I'm not a gamer, but a website developer.  Then I have 4 drivers later than July.  Take the latest??  4. Download the driver, create a restore point and update the driver?  Is that all I need to do?  5. I maybe incorrectly assumed Dell would keep these up-to-date and there might be some reason they did not provide this??  Not sure how this works.....  Thanks for your advice..... 1. Try what I said to disable Sleep and Hibernation. While Nvidia is still connected and being used... try making it WORK-PROPERLY 100% of the time. 2. OK 3. Yes, at nvidia.com . Yes, you can run the WHQL Studio-Driver. On my PC with RTX-3080 card, we are still running the Game-Ready Driver v511.79 WHQL/DCH from April-2022 ... it works great. I also run MSI-AfterBurner, and set the Power-Level to 80%, and no-Over-Clock (running at stock-clocks). 4. Yeah, pretty much. Click the "Do a Clean-Install" box in the Installer. 5. The files at support.dell.com are really to just to get the machine running. Windows-Update gives you pretty much anything you need going forward. Dell sells "Reference Design" video-cards, so you can get your video drivers at nvidia.com or amd.com (and Dell knows this). Finally, the XPS-8940 is not the current model any more ... they have moved on to XPS-8950.  
 AFTER my computer enters sleep mode, it never gets anything back on the screen. I can move the mouse and hit a key on the keyboard and the keyboard lights up like it is waking up, but the screen is black. I have to reboot to get it back. These are in the event log - have no idea what they mean. I spent 2 hours with tech support running every test they have access to, to no avail. I asked if the video driver might be a problem because this started when I did a BIOS update 2 days ago. The date on my DELL video driver is 7/22 and I noticed NVIDIA has a much newer one but not sure which one to try as there are several for this board. Tech support says that's not the problem but don't know what is. PS - one more oddity: when I hold in the power button to force a shutdown, the light goes off. Then 2 seconds later, the power light comes on, the DVD light comes on, they both turn off and the machine is down. I don't recall seeing that sequence before.....  Is that normal? It used to just power off and stay off. Memory: 64 GBProcessor: 11th Gen Intel(R) Core(TM) i9-11900 @ 2.50GHz[Cores 8] [Logical processors 16]Operating System: Microsoft Windows 11 Pro NVIDIA GeForce RTX 3060 Driver Version 31.0.15.1694
XPS 8940, crashes during sleep mode