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I have the same issue (different model) and it began after a BIOS update around 2/25/2020. However, my BIOS version is 2.13.0 (the release date is 11/14/2019 in spite of it being updated on 2/25/2020).

Are you running Windows or Linux? 

Where do you get the updates from?  I notice Dell's website only has .exe's. 

Actually, I'm not that confident about the bios update anymore. I thought it was an automatic bios update, since, on reboot, the computer stopped before grub was loaded and messages about updating the bios were displayed (on the black screen with Dell logo, before grub loads).

However, now that I check my update history with 'less /var/log/apt/history.log" I don't see anything indicating any bios update around Feb 25. And the release date of the bios was Nov 14, 2019.

How did you confirm that your bios was updated?

Linux

The bios updates are automatic via Ubuntu's repositories.

I am considering finding the version that I had previously, and just installing that again. 

I think it must have been on Feb 20. I see a bunch of upgrades that day (fwupd & fwupdate-signed ).

The bios is upgraded via UEFI Capsule updates described here: https://www.dell.com/support/article/en-ca/sln171755/update-the-dell-bios-in-a-linux-or-ubuntu-environment?lang=en.

Did you successfully roll back to a previous version? Also, how old is your computer? Mine is from 2017, but it worked great until this bios update.