Hi @nick
As usual, backup important data first.
if you have bitlocker, Remember to suspend protection for everytime you perform a major patch, e.g bios updates.
I encountered this before, sometimes due to bad drivers
go to dell and lookup support with your service tag..
Check for any drivers updates, especially on graphic card and chipset, wireless, ssd, etc/
check on msconfig, etc sometimes bad programs can cause this.
lastly check for any bios updates.