For me, Tech School at Keesler was 1964.
I think you're the first person I've met in a while older than myself. ha
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I've been chasing electrons all my life, most of it designing microchips.
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It's a good idea to use a storage scope to better "catch" and measure the negative going event.
Need my mailing address? 
@bossler maybe has the smarter fix for the controller sinking power from the Raspi: turn off the USB port. (I assumed that this would take down the device but he's got this working with OctoPrint.)
Ixnay on the Canakit if you have a model 3B+. I get the same errors, as do many others. I wish I knew what the issue was: I see undervoltage reported in the logs but it looks like a startup surge, like your lights dimming when something heavy starts up. It's not consistent and never happens during a print. Β―_(γ)_/Β―
You have seen this?
Yes, I did. These devices are failing now, even if they weren't 5 years ago. Why would I not share that?