I finally got Crispy IV (a Lenovo T420S running Ubuntu 24.02 LTS) to commit to a failure mode!
It's been acting like a heat issue, but the fan's been working every time I checked and it would fire right back up after holding the power button down.
I got a LOT of dust out of it Friday evening and today I decided to pull the keyboard to look and see if the fan was clogged.
More dust removed and the fan appeared to spin freely.
Put it back together and... "FAN ERROR" during boot.
The BIOS won't go past that, so it shuts off immediately.
Intermittent fan fail would cause the crashes I've been seeing.
Happily! I have a spare fan assembly for it in stock and JT is comfortable with taking it far enough apart to get at the fan. Hint, the fan is the first part into the chassis, so it's the last part out if you need to replace it.
I'm also going to have him teach me how to move the Home folder from Crispy IV to Derpy.
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