First thing to try is figure out whether it is a hardware or software issue.  Try do a fresh clean install of Windows 10 by wiping hdd or using a spare hdd (removing current hdd w OS from pc).  If problem disappears it is some malware causing problem. 
If w clean OS running it still shuts down randomly, then suspect hardware issue such as memory or chipset.

given your report on no shut down when streaming, suspect more likely software corrruption.

I'll give that a try right now. Thanks. 

@dalecway  Is the boot drive a HDD or an SSD? And exactly which model HDD or SSD is it? Some of the drives Dell installed in the XPS 8930 need firmware updates to "improve performance", etc. So make sure you've installed them for your specific drive, if any is listed on the XPS 8930 support page

Reboot and tap F12 at the Dell splash screen. When the F12 menu opens, choose the option to run Diagnostics and run all of them, including RAM and full boot drive tests. Note error message(s), if any.

Have you looked in Windows Event Viewer for any errors logged around the time of a crash? You can also run Who Crashed (free) to read the .dmp file, if one was created, to see if WC can identify the culprit.

I'd try running these commands before doing a clean install:

1. At the desktop, open a CMD prompt window, Run as administrator
   
   
2. At the prompt, type in: chkdsk c: /r and press Enter.
   Accept the offer to run chkdsk at next boot and reboot. It will run before Windows loads so be patient. Note any error messages when chkdsk is done. You can also look at the Chkdsk Log file.
   
   
3. Assuming no chkdsk errors, and back at the desktop, open a CMD prompt window, as in #1
   
   
4. At the prompt, type in: DISM.exe /Online /Cleanup-image /Restorehealth and press Enter
   Be sure to include a space in front of each / and note any error messages when that's done.
   
   
5. Assuming no errors in #4, at the CMD prompt, type in: sfc /scannow and press Enter.
   Be sure to include a space in front of the / and note any errors when that's done.
   
   
6. Assuming no "unfixed" errors in #2, #4 or #5, reboot the PC and see if the problem is fixed

If that doesn't help, and before you do a clean install, you should image the boot drive and save the image on external media. That way, if a minimal clean install (eg, Win 10+updates+browser+MS Office) doesn't help, you can re-image the drive back to where it was so you don't have reinstall everything again. You can use any imaging app you like, and there are several very good free ones like Macrium Reflect. You should also use the imaging app to create a bootable USB stick which you'll need to restore the image to the boot drive, if you decide to go back to that image.

I'm on the new hard drive with a clean win10 install. Nothing on here but explorer and roboform so we'll see how it does for the next few days. Thanks for your help. 

I have already installed a new hard drive with a fresh win10 on it. I will try your suggestions in a few days. Let me see if this works any better now. I have had this system run for 24 hours before shutting down so it may take me a bit before I know if its working. Thanks for your help. 

@dalecway  Let us know how it goes.

Keep track of what's been installed, so if you start having issues again, you may be able to identify the culprit more easily. And you might want to image the drive as you do additional installations, so you don't have to go all the way back to a totally clean install if something starts causing the shutdowns again...

The good news is that the machine is still up and running. The bad news is that I don't really know if it's a clean windows install or the fact that I removed that Intel 16 gig optane drive. In my search to solve this problem I came across many instances of the Dell 8930 machines doing random shutdowns and reboots. I'm really starting to think it has something to do with this optane drive.