Yes - the timeline window is helpful but you need to look at and show the
Reliability details listed below the timeline window.
Clicking individual Errors (red circle), Warnings (yellow triangle), or informational events (blue circle) will provide more technical details about what happened. The technical details may or may not be helpful.
Note that on the right end of the timeline that the types of failures are presented. Namely Applications, Windows, Misc..
Take a closer look at the details available. Look for named apps, processes, services, and so forth.
Also run "dism" and "sfc /scannow" to find and fix corrupted files.
FYI:
https://www.windowscentral.com/how-use-dism-command-line-utility-repair-windows-10-image
https://www.lifewire.com/how-to-use-sfc-scannow-to-repair-windows-system-files-2626161
The immediate objective being to just try cleaning up any corrupted or buggy files.
Or identify other problems. Could have been a corrupted update.