How can I check what caused a recent system hang?

Hi all,

In a nutshell, I have a Dell XPS 13 which is having system hangs frequently. Dell has replaced most of the hardware (motherboard, heatsink assembly, SSD) and the problem is not fixed. I've clean installed the OS (Windows 10 Pro) multiple times and the problem is not fixed. The laptop is still in warranty but I want to narrow this down before I invoke the warranty (I know more of computer fixing than the Dell L1 support guys, who just want to keep replacing hardware parts, even if they've been replaced before).

When the system hangs, the mouse pointer works, I can toggle Caps Lock on or off, but most other things stop working. There's not much I can do but force a hard reboot, but once I do that, the laptop is usually stable for a few hours. What can I do to investigate what caused the previous system hang?
Thanks,
I didn't find the right solution from the internet.

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