Contrary to the opinions of some, canned air (or using air compressors and the like) may temporarily fix problems, and once in a blue moon (when exceedingly lucky) even permanently. But more often than not, that air pressure only make problems worse, by taking the liquid (most common culprit) and sending it into critical areas that it might not have reached yet, turning what might have been a salvageable situation into a permanent landfill item. Best advice, don’t use air unless you’re blowing dust out.
Given you’ve already tried different sets of batteries and gotten the same results, you can rule out batteries.
Given you’ve already tried to update the firmware, and have the same results, you can rule out firmware.
That leaves one thing. It’s without a doubt a hardware related issue. Now, that’s still very open ended, but…
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the wiring: you could have a (non-visibly) “pinched” wire, that makes solid enough connection while in a “cool-state” and only rears it’s head once it’s gotten to a certain wire temp, or past a certain amount of current. OR, you could also possibly have a cold solder joint. Normally indicated by small circles, but sometimes visible as “ripples” within the solder itself. Google “cold solder joint” images for examples. Reflow any questionable joints.
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(as mentioned above) You could also have debris in your 510 connector path. Easily handled with a Q-tip, some isopropyl alcohol, and possibly a magnifying glass and some tweezers.
The more complex…
Now, outside looking in (judging by written description) it sounds more like there’s a problem with one (possibly more) of the ic’s onboard.
Possibilities include:
Either way, when I find such symptoms, and do a search, then see lots of failed reports with almost identical descriptions, my first thought is one of two things. Flawed design, or faulty manufacturing process. Either way, the next question is then "is it under warranty. If yes, no canned air, no opened screws, pass go and proceed directly to the vendor or manufacturer.
Will continue to watch with interest
EDIT: auto-correct, and clarifying thought on a small aspect