It's a bug, it seems to happen more alt/tabbing, but can still happen. To correct it, save and reload, it will reset.
I wish someone would mod it so that it didn't activate so early. I haven't timed it, but I can't recall in years ever being forced to stay down so long it maxed out. I've pulled off attacks, done night long end arounds and attacked again with the bug before it came close to maxed.
I finally cut the CO2 option off because of the bug and the fact it's never been an issue with the levels rising enough to kill me.
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