2014 Macbook Air turns off intermittently for no reason.

     Several days ago my Macbook Air started completely shutting down randomly, even if I've got 95% battery. It doesn't go through a shutdown cycle or anything, just suddenly a black screen. I'm usually able to just turn it back on but there have been a few instances where I can't get it back on. The only way I can get it to come back on after that is a combination of dumb luck and endless SMC resets. It seems that I don't have this issue when the laptop is plugged in to the charger.
     From my perspective it seems as if there's a software issue. The battery is fine and the charger works fine. It almost seems as if somewhere along the line the software screws up and for whatever reason thinks that the battery is dead, which would explain why It doesn't happen when I'm running off of an external power source.
     Any suggestions on how to keep this from happening?

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