Pi Undervoltage/power issues: I had a strange lightning bolt/temperature symbol with an exclamation mark popup in my navbar, what does that mean?

The question was about the warning on the pi, not "what can I replace it with"

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That solved my problem. Now I can update octoprint. I am way out of date.
I have tried many of the suggestions with no joy. Is it just the PI3 ? is PI or 5 better with power? (maybe I need to read more)
Octoprint works fine for 4-5 years with symbols. I am a hobbyist and I honestly don't care, as long as I can print. The sneakernet works great for me too, if all the electronic wiss bang stuff goes haywire.. Thanks for the thread ...