Massive framerate drops on RTX 2070 gaming laptop

Whenever I enter a multiplayer match, my framerate plummets down from 60fps to 17fps within a minute or so of playing. Whenever I unplug and replug the charging cord from my laptop, my framerate slowly returns to normal for about 1 minute until eventually, it drops back down to 17fps. As a result, I have to unplug and plug-in my laptop around 10-15 times per game. Changing graphics settings doesn't help. My laptop cord is fine and any other game runs smoothly at max settings. Any opinions on why this is happening?

specs: intel i7-9750H 2.60 GHz, RTX 2070, 16GB RAM