Battery is not fully charging or has failed. (replace and recharge) Also, CPU may be overheating/failing. This requires thorough cleaning and vacuuming of the laptop. I would suggest professional service. Disassembling a laptop is not for the first timer by any means! Finally, there is a chance that the power connector at the rear of the laptop is beginning to loosen at the PCB where it is soldered in. This is a common failure point, and again, sadly requires professional repair. As you can see, all roads pretty much lead to a professional close-up evaluation.
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