cuts out

My PC as of today will cut power during gaming. I built the PC around about November time. It has worked fine without issue until today. I can load a game and get around 5 minutes into gaming at which point the PC will just shutdown and immediately restart. As far as I can tell this isn't an...

Why playing plugged in boost 20-30+ FPS ? Is this normal or there's something wrong ( by the way my laptop is Dell Inspiron 15 2017) is playing plugged in for hours damage the battery ? THANKS